I made a COP hda that will be the core of another hda. I didn't realize that when I started to developpe it and the core is written as .hda file in my otl folder.
Is there a way to create a .otl library containing the core hda and the high level hda together ?
You can put multiple assets inside a single .hda in the same way you would with a .otl file. So you would simply choose that .hda as the file to save your high level asset to.