Cycling Through Two Ranges To Complete Blank Data

Any way to cycle through two ranges and fill in blank cells. The worksheet has a "header"(A2:H2) that bascially determines how the rest of the sheet will be filled out. This header is subject to change if one of the headers is changes(see PLAN, and TRAN CODE in example).

PLANSSNDATEFUNDSRCTRAN CODEITEM CODEAMOUNT (CASH)56016999-99-9999FBLNK01699161.00022.00033.0060988999-99-9999fBLNK0150595.00026.00037.00

The SRC and AMOUNT(CASH) fields will always be complete. What I'm trying to do is cycle through AMOUNT(CASH) and if the field is not blank to then cycle through crng lookig for blank cells. If the cell is blank it should copy the cell above. This is where I'm headed but it will cycle through the same crng(A3:H3) every time.

Public sub Line_Check
Dim ccell As Excel.Range
Dim crng As Excel.Range
Dim hrng As Excel.Range
Dim hcell As Excel.Range

'skip A1, A2(add code to validate headers)

[Code] ........