@apretorius62 We are in the metal industry. The way this is usually dealt with is via a conversion to tab weight. The calculation of tab weight for an item is usually done based on an “idealized” weight metric.
For example, you would take a standard density of material: https://www.sandmeyersteel.com/images/Alloy304-304L-APR2013.pdf
According to the above link, the density of T304 Stainless Steel is .285lb / cubic inch.
So if you have a 1” thick piece of T304 Stainless Steel, 20” X 20”, then we have 20 * 20 * 1 = 400 cubic inches.
400 in^3 * .285lb/in^3 = 114lbs
So, let’s say that we buy a pallet of 100 T304 sheets, 20 X 20. We pay $10,000 for this pallet (random cost I made up).
Then to figure out our cost at tab, we multiply 114 lbs (weight of 1 plate at tab) * 100 (number of sheets we bought) = 11,400lbs of plate. Our cost at tab is $10,000/11400lbs = $0.877/lb
This allows you to have a standard conversion in your erp between say the area of a sheet of plate and its weight.
You don’t want a variable conversion factor for the sheet, trust me. The way I have described above is the correct way to handle this. It redistributes your cost and your selling price across a standard weight metric for the product. Then you can have standard conversions for UOM using the native Acumatica functionality (i.e. for a given size sheet, 1 sheet = 114 lbs = 400 sq in = etc).