you can save them
“Just to expand on the regular presets facility… If you create a bunch of presets for your digital asset, you’ll end up with a file called $HH/presets/Object/myasset.idx, or something similar. This is the file that contains all the preset definitions you have saved. Find this file and remember where it is. Now open the Operator Type Manager and find the definition of your asset. Right-click on it and choose “Edit Contents…”. On the left is a list of “sections” that make up your digital asset definition. Below that list is a spot to enter the name of a file. Use the Plus button to open up a file browser and find the .idx file containing your presets. The “Section Name” will be set to the name of the .idx file. Change the Section Name to “Presets”. Hit the Add File button. Hit Accept. Now those presets are stored with the digital asset.
This ability to store presets directly in a digital asset definition isn’t well advertised because it is far from being an automatic process. Updating that Presets section requires saving it out to the .idx file, adding or editing the presets in that external file, then re-adding the .idx file using the Edit Contents dialog. It’s not pretty, but it can be a very useful feature. “