Need help with some counting and multiply formulas

[Dzuna]

PCS..jpg

I need some help with this one, i have some items that are in (B1-B8) that come with parts (A1-A8)
Need to sort all of the parts one buy one so is there a formula or some thing to get results like in (E-H)

[NBVC]

In C2 enter this helper formula first:

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In E2, enter:

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confirmed with CTRL+SHIFT+ENTER not just ENTER and copy down.

in F2:

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in H2:

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