Synchronize independent spreadsheet rows, filled by IMPORTRANGE()

Question

I need to synchronize the contents of 2 spreadsheets that reference each other, keeping their rows in sync if a new row is added in one of the sheets.

I\'ve got 2 sp

Answer 1

the current answer by mogsdad is great as always. i just wanted to point out a less complex alternative:

if you can live with preventing spreadsheet1 from allowing insertions or deletion of rows, you will avoid the issue. instead of removing rows you could use a column to mark "deleted" for example (and use filters to remove from view).

to prevent row insertions and deletions in spreadsheet1, simply select an entire unused column to the right, and create a protected range so none of the editors have permission. that prevents modifying at the row level up to the last existing row (but new rows can still be inserted below the range)

it also doesnt prevent users from swapping two row's data. but its still good to know about this simpler alternative.