Complex Google Sheets Puzzle - Help appreciated - Link to sheet included - google-sheets

Question

I have a finance sheet that tracks the following in different columns:
(A) Amount Already Built Into Budget for the Year [Purple]
(B) Amount Spent Year-to-Date [Red]
(C,E,G,I) Q1-Q4 Reimbursement amounts [Green]
(D,F,H,J) Q1-Q4 Hidden columns to be used to help create this function and to tick on and off based on reimbursement amount input [Gold]
(K) Reimbursement Remaining [Blue]
The amount already built into the budget needs to be divided by 4 and to show up on each quarter as reimbursed. That amount will be entered into each quarter by default with a code that divides Column A by 4. The user will replace that value each quarter by adding the column K value to the value for that quarter.
Each quarter, the user should be able to add the value in column K to the appropriate quarter and end up with zero balance in column K.
The Amount Spent Column will update monthly and include:
Expenses built into the budget to-date
Additional expenses to-date
The goal of this sheet is to allow someone to input how much was actually reimbursed in the Q1-Q4 Reimbursement amounts [Green] and to provide a tool for that person to know how much needs to be reimbursed at any given time in the Reimbursement Remaining [Blue] column.
Column K needs to still be able to function if all expenses appear in the actuals Q4--meaning, Column K will need to be zero for Q1-Q3 and only show a balance if the sum of the actuals recorded exceeds what was built into the budget.
Wow that was hard to write out.
What is a formula that could go in Column K to make this work?
I hope this makes sense to someone!
-Alfred

Answer 1

try:
=if(C2+E2+G2+I2=A2+B2,0,
if(AND(D2+F2+H2+J2=0,D2=0),B2-C2,
if(AND(D2+F2+H2+J2=1,D2=1),B2-C2,
if(AND(D2+F2+H2+J2=1,F2=1),B2-C2-E2,
if(AND(D2+F2+H2+J2=1,H2=1),B2-C2-E2-G2,
if(AND(D2+F2+H2+J2=1,J2=1),B2-C2-E2-G2-I2, 0)
)))))