How can merge column or cell table on Doc file?

[minhdv48]

I tried some ways but not success. I can't see your code process this issue. If you can, Please guide me! That is great for me. Thanks so much!

[DavidDXY]

I have the same problem

[egonl]

This is not supported out of the box, but it should be fairly easy to implement with with DocumentFormat.OpenXml's GridSpan. See https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.wordprocessing.gridspan?view=openxml-2.8.1 and the Inheritance example.