pdf bookmark hierarchy

I have a 150 page Corel draw document that I need to export to pdf. I have many bookmarks that cover topics that spread over several pages each.

I would like the pdf export to generate the bookmarks sections with my bookmarks at the highest level, that could be opened up into the subsections of the page names. Any way to set that hierarchy?

If not, can I export to pdf  showing my bookmarks only, and not show page names in the bookmark section?

Can I create all bookmarks myself, for each page, and have some bookmarks be in a subsections (lower hierarchy) of others?

If all this can't be done, what would be the best way to get there using an other application, starting from my 150 page Corel draw file?

 

thanks,

Stefan