Lookup Nth Occurence In Range & Limit Rows To Search Based On Cell Value

I have a UDF for a lookup_occurrence formula (thanks to Dave), and I was wondering if it was possible to tweak the range it looks at with if statements.

I have a formula like this =Lookup_Occurence(B13, INDIRECT($N$5), 1,1,5) where N5 says exit card 1.

I need it to only look at a certain rows within exit card 1 depending on the value entered in I5.

If value I5 says Period_1 it will only look in rows 12:46.

If value I5 says Period_2 it will only look in rows 48:82 etc.

I believe I need to modify the xl look part of the code with if statements.

Below is the code. I am wondering if I can replace the xlLook line with nested if statements. If I5="Period_1 then rows 12:46" etc.

Function Lookup_Occurence(To_find, Table_array As Range, _
Look_in_col As Long, Offset_col, Occurrence As Long, _
Optional Case_sensitive As Boolean, Optional Part_cell_match As Boolean)

Dim lLoop As Long
Dim rFound As Range
Dim xlLook As XlLookAt
Dim lOcCheck As Long