Do I understand this correct?

[anendeloflorien]

I have a hypo male
If I added a jungle pastel 100% het hypo, I potentially could hatch a hypo jungle pastel.

Are there morphs that would potentially not give a "combo morph" through breeding my hypo to a morph that is 100% het hypo?

Sorry Im trying to learn all of this

Yes you could hatch a hypo pastel from that pairing since pastel is a co-dominant gene and ghost or hypo is a recessive gene which both parents are carrying. If you are breeding your hypo to a 100% het hypo if they are a co-dom morph then you would always have a chance at getting the combo.
Hope this helps (tm Adam Wysocki)