RE: Item Substitution - Substitute Item with Different QTY in BOM
MahGah,
You can perform the component substitution process and alter the Qty. Per value. Here is an over view of the process (NOTE: I used my old NAV pictures as the process overall has not changed)
There are times in a manufacturing company where substitute items that are not on the Bill of Material are OK to use if the preferred item is not available. Often this substitution has to be approved by an engineer and is usually in the form of a ‘Usage Variance’. If substitutions are a common event, it might be useful and time saving for the engineering department to set up ‘Item Substitutions’ ahead of time so that an individual variance doesn’t have to be approved and signed each time.
To set up a Substitution in Dynamics, go to the Item Card for which a substitute is available.

Figure 1 – Item Substitution entry
Then enter the item number that is OK to be used as a substitute.

Figure 2 – Enter the item number of the item that can be used as a substitute
Now, go to the component list of a production order and select the substitution that was approved by the engineering department.

Figure 3 – From the component list of production order…

Figure 4 - …select the approved substitution
The production order component list now contains the substituted item. You can update the Qty Per if necessary.

Figure 5 – The production order component list shows the substitution

The above pic come from a Released Prod. Order, component page to Select Item Substitution.
Hope this helps.
Thanks,
Steve