A way to handle columns that span multiple rows. Request a script.

This solution does not require merging cells, you may need to manually modify the contents of a column that spans multiple rows to the appropriate position (of course it would be best to automate this). 

I think this is a bit safer and less work, and easier to implement .

The biggest benefit is that only the initial discharge needs to be treated.

A specific program：

Insert a block at the cursor and apply the object style "point".

The point object style has automatic height and width adjustments and has non-printing properties.

The content of the block is  "content across columns". 

From the first row of the spanning column, to the penultimate row, apply the cell style "spRows-none". 

Ask for a script.

Thank you very much.