How to make column heading in a table cross multiple pages

Heading rows are automatically cloned to table continuations.

if you aren't seeing heading rows on subsequent pages (and you can tell because you can see them but you can't edit them there), the usual reason is that what appear to be heading rows on the first page are just body rows with heading paragraph formats.

If all real heading rows have been deleted, it's usually easiest to just create a new table with heading rows and copy the content over.

If the heading content is entered in a Heading Row, then this will be automatic.