Submit record to categories in multiple section

Hello scholttu, a record can belong to 1 section, but to multiple categories inside!
Submission is bind to 1 section.

The only "exception" is, you might have relation fields. That would connect two different types and sections. It would also display records from 2 or more sections in a list.

In addition, Cobalt allows to submit multiple types to 1 section!

I need to show a page with items from multiple sections, how can I do that? If that is not possible, can I move one category into a different section without losing the items in that category?

scholattu I need to show a page with items from multiple sections, how can I do that?

Not ideal, but multiple Record modules might work.
Each module instance lists a different section.

If that is not possible, can I move one category into a different section without losing the items in that category?

To my knowledge, there is no mass/bulk change for such a structural change.
I could imagine a custom tool might solve this.
There is an older docs article and user's suggestion for bulk changes,
and since Cobalt 8.738 another option to create and add your own tools.

Apart from that, Sergey might give you some hints about the related DB tables and section/category storage.