every possible combination of the contents of 2 columns in excel

Question

Suppose I have 2 Columns:

1st column(contains 1000 rows):

U-0001

U-0002 

2nd column(contains 10 rows):

B01

B02

B         


        

Answer 1

Here's a formula version:-

=IF(ROW()-ROW($A$1)

Enter it in (say) C1 and copy down.