Need formula for Blank cells to copy previous cell data

Hi All,

Need a Formula to copy previous cells data if the cell is blank. following are the conditions.

1. if there are any blank or non numerical value in any cell, previous cell data should be copied except for 2nd row(b2,c2,..).

2.if there are any blank or non numerical data in 2nd row cells they should left blank.

3. blank cells should not contains any "0".

Attached the excel sheet for reference.



Thanks.