Multiple Complex IF conditions using 3 Tables - excel

Question

If negative value is found in Total row (A2) in Table 1
Then look for fruit with the highest qty in that month in Table 2
Add the fruit qty to Table 1, a month prior so that the Total is equal to or greater than 0 at an incremental qty found in Table 3.
Please note that Total is sum of all fruit qty + previous month's qty - demand (not shown), it's cumulative.
So basically, we have -5 in March in Table 1.
Apple is the highest in March in Table 2.
So add 8 (2 boxes of Apple) to C4 (a month prior to March) in Table 1
I'm not sure if this is even possible using just a formula, maybe VBA is needed?
If this can be done using a formula would go into B3:G5

Answer 1

Put this in B3,
=IF(AND(C$2<0,MAX(C$8:C$10)=C$10),IF(MAX(C$8:C$10)=C$8,(INT((0-C$2)/$B$13)+1)*$B$13,IF(MAX(C$8:C$10)=C$9,(INT((0-C$2)/$B$14)+1)*$B$14,IF(MAX(C$8:C$10)=C$10,(INT((0-C$2)/$B$15)+1)*$B$15,C$2))),"")
and drag to G3. then put this in B4,
=IF(AND(C$2<0,MAX(C$8:C$10)=C$8),IF(MAX(C$8:C$10)=C$8,(INT((0-C$2)/$B$13)+1)*$B$13,IF(MAX(C$8:C$10)=C$9,(INT((0-C$2)/$B$14)+1)*$B$14,IF(MAX(C$8:C$10)=C$10,(INT((0-C$2)/$B$15)+1)*$B$15,C$2))),"")
and drag to G4. then put this in B5,
=IF(AND(C$2<0,MAX(C$8:C$10)=C$9),IF(MAX(C$8:C$10)=C$8,(INT((0-C$2)/$B$13)+1)*$B$13,IF(MAX(C$8:C$10)=C$9,(INT((0-C$2)/$B$14)+1)*$B$14,IF(MAX(C$8:C$10)=C$10,(INT((0-C$2)/$B$15)+1)*$B$15,C$2))),"")
and drag to G5.
Idea : convert input to positive value, find max, amount to order = ( (Positive input/incrementalQty)+1 ) * incrementalQty
Have a check.