In need of some excel expertise!:

I have two tables:

Table 1
Part #, Quantity

Table 2
Project #, Part #, Quantity for Project


I want to create a 3rd table that combines the above tables. Table 1
will act as the master and I will continue to add projects to Table 2
(each time that a project is added to table #2, I want for that part
#'s quantity to subtract from the respective quantity on table #1).

I have tried creating a consolidated pivot table, but it did not work
consistently. Can someone please advise as how to create a vlookup to
achieve this?

Much thanks!