the short answer is create a formula using shared variables.

 

you would need to know what you want row 4 to do (or the range of options) then you would need to keep track of the values you want row to act on.  If it is always just 3 rows, you could name variables, but if the number of rows is indeterminate at the time of design, you would probably need to use an array of shared variables.

 

HTH