Linking independent and dependent drop down costs to master budgets

[RookieBookie]

Hello,

As stated in my username, I am a rookie and in desperate need of help.

I am trying to deduct amounts put in cost cells from two different sheets/tabs.
I have five dependant drop down lists linked to five tables (rows k to s), and one independent (row u).

I would like the cost choices made in "Activity" to deduct from their related cells in Master Budget sheet.
I would like cost choices made in "Action Plan Specs" to deduct from their related cells in Action Plans Specs sheet.
So, the amount in cost to deduct from two cells in two sheets.

Any help would be sincerely appreciated as the ways I'm thinking will take for absolutely ever to do.

The link to the worksheet is below
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