How to get a Vlookup to populate with an IF Statement, or visvera?

Question

I have IF Statement

=IF('[Mtch Index.xlsx]Sheet1'!$B$2-B2<0,'[Mtch Index.xlsx]Sheet1'!$B$1,IF('[Mtch Index.xlsx]Sheet1'!$C$2-B2<0,'[Mtch Index.xlsx]Sheet1'!$C$1,IF('[Mtch Index.xlsx]Sheet1'!$D$2-B2<0,'[Mtch Index.xlsx]Sheet1'!$D$1,"GOOD")))

This is doing a subtraction of ordered quantity from inventory on hand by week. If the quantity is < 0 then it tells me the week number in the column header. If it does not go less then 0 it moves to the next column/week.

I need to incorporate a VLOOKUP in to this. So my lookup_value is the item number, when it locates the item on the second spread sheet, I need it to run my IF formula. This would tell me if the order is GOOD, or have it populate with the corresponding week number [Mtch Index.xlsx]Sheet1'!$B$1.

I thought maybe utilizing an index formula to help, but cannot work out the logic myself. Anyone have some thoughts?

Answer 1

maybe this?:

 =IF(ISERROR(VLOOKUP(lookup_value,range,col_index,0),"",IF FORMULA HERE)

I didn't know the details so i provided generic arguments.