I have a rather large database with two sheets of data. I want to take sheet
two and put the data in column C to sheet one column C where A and B match on
both sheets.

Sheet One
A B C
1 100 4
2 200 1
3 200 2
4 200 5


Sheet Two
A B C
1 100 4 CAR12
2 100 4 WIL13
3 100 4 CAR14
4 200 1 CAR15
5 200 1 CAR16
6 200 2 CAR17
7 200 5 WIL18

What the result should look like
A B C
1 100 4 CAR12; WIL13; CAR14
2 200 1 CAR15; CAR16
3 200 2 CAR17
4 200 5 WIL18