How can I merge specific rows?

Create a column in your sheet and name it whatever you want. Say ‘Exclude Rows’. Then type 'yes' or whatever (as long as its not empty) in the rows you want to exclude from merging.

Then open the Options dialog and set the ‘Exclude Rows’ in the ‘Merge Specific Rows’ option. Click save to apply changes.

When you merge to emails or letters, rows with a value in 'Exclude Rows' will be excluded from merging.