Zack Barresse wrote...
You could use something like this ...

=INDEX(Sheet1!$A:$A,(ROW(A1)-1)*21+1,1)

This is assuming that you want to only see the data in each sequential row
in sheet two. Put this formula in a cell, then copy down as needed. It
will only show every 21st row, starting with row 1 of Sheet1.
....

This formula would need to be placed in some cell in Sheet2!1:1 in
order for it to reference Sheet1!A1. Generally safer to use ROWS than
ROW, so if the topmost result cell in Sheet2 were B5, the formula would
be

B5:
=INDEX(Sheet1!$A:$A,ROWS(B$5:B5)*21-20,1)