looking for a macro to search and replace within rows and the do the same in the next row

i have a csv file with one row, i copy and paste the row 50 times

four of the columns (H, I, N, BJ,) have text including a number in them ie A1123, (the same number in each column )

i am looking for a macro / script to search for "A1123" in each row and replace the number with the next consecutive number, right through the 50 rows

so each row has consecutive numbers within the four columns

ie row 1 will have A1123 in the 4 x cells

row 2 will have A1124 inthe 4 cells
ect ect

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