To convert Prop hair (Poser HR2) to Genesis is kind of straight forward
I’m using DS 22.214.171.124 so things might be different on older or newer builds.
Load Genesis into an empty scene, making sure it doesn’t have any morphs dialed, with it selected load in the HR2 hair you want to convert, it should auto parent to the head bone of Genesis. Select the hair either in the viewport or in the scene tab, then go “Edit > Object > Rigging > Convert Prop to Figure”, in the new window make sure TriAx is selected and that you have a “tick” next to “Inherit Skeleton”, then click Accept.
You now have a TriAx figure hair, but it’s still shaped for the original figure, so still doesn’t fit Genesis.
Now start the Transfer Utility (Edit>Object or Edit>Figure menu’s), top left you’ll see “Source”, select Genesis for the “Scene item” and Clone for “Item Shape”, you’ll get a little menu showing all of the Clones you have in Genesis, pick the one the hair was designed for, to the right of those you’ll see “Target”, the scene item is your hair and the item shape you leave at Default.
Under these you’ll see “Projection Template”, click it and select the hair template that suits your hair (long or short).
Bottom left you’ll see a buttom called “Show Options” click it, now leave everything here as you see it, except “Reverse Source Shape From Target”, put a ‘tick’ in it’s box, now go ahead and click Accept.
The hair now fits Genesis, it’s now time to save it so you don’t have to go through all of that again with this hair, with the hair selected go “File > Save as > Support Asset > Figure/Prop Asset”, select where your saving the DUF to and give it a name. You’ll get an Assets save options window, with autofit or converted items I usually leave the vender name as my own, the Product name I put the original vender’s name and the Item name is the product’s name, this way all my converted items are out of the way, and I still know who the original vender was.