I Use Lavender Fragrance in Three Different Products — How Do I Combine All Three BOMs to Determine the Correct Fragrance-Oil Reorder Quantity?

Three products, one bottle: why the oil is one stock line

When the same fragrance goes into several products, each product's BOM has its own Lavender line — different fill, perhaps a different load, a different number of units. It is natural to order from each BOM: a bottle for the jars, a bottle for the tins, a bottle for the hearts. But on the shelf all three draw from the same stock. Ordering per product creates two problems. The packs come out smaller and dearer per gram, because each product's need lands in a lower pack tier. And the reorder decision is made three times, against three imaginary stock levels, so one product can run dry while the oil it needs sits in another product's bottle.

The fix is to combine the three BOM lines into one monthly requirement for the oil, set one reorder point for it, and place one reorder when the shelf reaches that point. The three products keep their own BOMs for production — the combined figure is only for buying. This page does it for Lavender across three candle formats in Luxury Soy Wax CSI 464. If one of your formats is a wax melt, the candles-and-wax-melts post covers the different loads involved.

Step 1: the three Lavender lines, one per product

The three products are the reader's example. The 180 g fill in the 200 ml Salsa jar is the reader's weighed fill (CSI does not publish one); the Golden Aluminium Tin has a published 85 g fill and the Heart Cutout Velvet Jar a published 50 g wax capacity. The jar and tin run at 8%; the small heart runs at 6%, the reader's own formula for a candle that burns in a small space. All three are inside CSI 464's 10% ceiling. Allowances: 2 QC candles per product, an example 3% reject rate, 4% pour loss on wax and oil.

The jar candle uses 68% of the month's Lavender, the tin 24% and the heart 7%. That is the share to watch: if the jar candle's sales jump, the oil runs short for all three products, so a forecast change in one product must update the combined line at once. Per-SKU forecasting gives you the units per product; this page is about what happens to the oil after that.

Step 2: combine, then round once

Lavender's listed prices are ₹105.02 for 15 g (₹7.00/g), ₹270.00 for 50 g and ₹540.00 for 100 g (₹5.40/g), ₹2,620.00 for 500 g (₹5.24/g) and ₹5,221.00 for 1 kg (₹5.22/g). Rounded separately, each product's need lands on its own mix of packs. Rounded once, the combined need reaches the 1 kg tier for most of the volume.

The saving is real but modest — ₹204.02 a month — and that is the honest headline. Lavender is one of the many CSI oils whose per-gram price barely moves above 100 g (₹5.40 to ₹5.22, about 3%). The bigger gain from combining is not price: it is one bottle to track, one reorder decision, and no 15 g top-ups at ₹7.00/g because one product's bottle ran out before the others. For an oil with a real break at 1 kg — British Rose, Mango Coconut, Honeydew Melon — combining saves more; the 1.3 kg post works through 500 g and 1 kg combinations.

Step 3: one reorder point and one reorder quantity

A reorder point is the shelf level at which you place the next order, so that the new stock arrives before you dip into safety stock. It is daily usage × (lead time + safety days). The combined Lavender usage is 2,758.5 g ÷ 30 = 91.95 g a day. CSI publishes no lead times, so use your own experience of order-to-arrival; this page uses a labelled example of 5 days, plus 7 days of safety stock. Reorder point = 91.95 g × 12 = 1,103 g; safety stock = 644 g.

The diagram shows how that plays out from an example starting stock of 1,400 g: usage draws the shelf down at 91.9 g a day, the order goes in the day it crosses 1,103 g, and it lands 5 days later with the safety stock still intact. If you used three reorder points — one per product — they would add up to the same 1,103 g but be checked against three made-up stock levels, which is exactly how the allocation trap starts.

The month's order for the three Lavender products

The combined Lavender order sits inside a normal monthly order for the three products. The wax is Luxury Soy Wax CSI 464 (₹507.40 a kilo at 1, 5 and 10 kg). Wicks are the reader's tested choices — Eco Thick C2 in the Salsa jar, Eco Thin C1 in the tin and the heart; CSI publishes no wick-size-per-diameter chart. Breakage of 2% is applied to the glass Salsa jars only.

At the combined Lavender rate of ₹5.25/g, the oil in each product costs ₹75.60 (jar), ₹35.70 (tin) and ₹15.75 (heart). That is the figure to use in each product's costing — the shared bottle has one price per gram, whichever product draws from it.

Buy now, buy after testing

All three formulas are tested, so the month's Lavender can be bought now. The case worth showing is a formula change in one product, because it changes the combined line for all three. Suppose the reader wants to try the Salsa jar candle at 9% instead of 8% — still inside CSI 464's 10% ceiling. That adds 1.8 g of oil per candle and about 236 g a month, which would move the combined order to 3 × 1 kg (₹15,663.00). None of that is bought until three 9% candles have cured and burned against an 8% control.

The month's order leaves almost nothing spare — 6.5 g of Lavender, 1 Salsa jar and 4 Thick C2 wicks — so the trial is bought as its own small lines rather than borrowed from production: 1 × 50 g of Lavender for the 50.5 g three 9% candles need, and 1 × pack of 5 Salsa jars; the wicks come from the spare four. That is ₹470.60, kept outside the production subtotal above. Borrowing from production instead would bring the reorder point forward and leave three candles short at month end.

The CSI products in this order

Doing this for every shared oil

The same combine-then-buy rule applies to every shared material: wax across 20 SKUs, one jar across eight fragrances and wicks across three sizes. When all the reorders land in the same week, one consolidated monthly order puts them on one invoice. The full pipeline is on the cluster hub.

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