Use the Data Options tab to define how to merge relational data such as comments, attachments, and supporting detail when pushing data.
Do not copy—Do not copy relational data.
Ignore when multiple cells merge into one cell—Do copy relational data if multiple cells form one cell.
Overwrite when multiple cells merge into one cell—Replace existing cells and attachments with the latest supporting detail data when cells merge
Append multiple cell data into one cell—If multiple cells merge into one cell, add, append or merge the supporting detail from all the source cells into the target cell.