Question 'if' statement = true a list box appears, strikethrough and deduct.

I need help trying to figure this spreadsheet out. Here is what I want it to do. I think I have gotten pretty far for being a novice/intermediate with excel.

Looking for some help from you wonderful folks.

- I need to be able to have a yes/no drop down box appear in Hx if Gx askes if "Is this a spare?" Along with this, if yes is selected from the drop down it needs to strikethrough any Fx box that that is in the same column, while at the same time deduct that amount from C13.

I have other questions I have on this spreadsheet and will create corresponding threads for them

Thanks.