Hi Karin,
1.) Currently SKIPIF is not supported, you can find a list of all supported fields at the end of this help page:
https://www.gemboxsoftware.com/document/docs/mail-merge.html#mail-merge-options
Before investigating further this requirement, I wanted to check with you if you could use a quick workaround to this and just filter out the records in your data source?
2.) IF fields are supported, but it can contain only inline-level elements, not block-level elements. Also, the resulting text will always be formatted based on the IF field’s formatting.
Note that in the future we plan to address these limitations and provide better support for IF fields updating.
Last regarding the Catalog merge, is it possible for you to send us a small Visual Studio project that demonstrates your use case?
I would investigate your input document and the provided sample data (a small DataTable object).
Also, can you please send us the desired output document, the result that you would like to get from merging that provided sample data?
You can create such a document manually with Microsoft Word, I would just like to check exactly how the result should look like.
Regards,
Mario