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ok, i have an ork that i want to put a custom head on (resin cast part) but the ork body where the head would normally go needs to be built up a bit in order for the head to fit correctly onto the model .. how would i go about doing that? just some modeling clay? or glue a sprue part on there then file it down? ...

Two-part epoxy putties are the usual weapon of choice for tasks like that. Greenstuff (Kneadatite) is the most common and well suited to sculpting organic forms, due to it's somewhat rubbery nature, but others (Milliput, ProCreate, etc.) would work in a pinch.

Modeling clay isn't recommended, as it remains pliable almost indefinitely (dries out a bit, but it doesn't cure in any way). Polymer clays are suitable for sculpting parts, but require baking - that means no on-model additions. Air-dry clays could work, but will neither bond as strongly nor wear as well as an epoxy putty (I find them less suitable for detail work, as well).

hmmm i forgot i had some of the greenstuff in a drawer ... time to see if it is still any good ... guess i should put a pin or something in it as well though right? ... it isn't something that will be real visible ... just to get the head to stand away from the body by a small amount and to give a surface to afix the two parts ... right now i can push the head up against the body flush and there is still a small gap between the two so i can not glue them ...

Then your best bet is probably a pin with a little green stuff to gap fill, that is assuming ofc that you can get into the area between in order to fill the gap. The pin is simply to add strength and should stop his head popping off.

If the fit is so tight that you'll not be able to get any GS into there then perhaps filling down some sort of plastic/sprue is best.

The GS should still be good - the stuff lasts for years (unmixed, obviously), at the very least. If the issue is an internal gap, sculpting won't be necessary. Just mix yourself up a small blob to fill the space and stick it in there before you attach the head. If you use CA glue on both sides (i.e. body>glue>GS>glue>head) and have good contact, a pin shouldn't even be necessary (although it will still add strength - no harm, beyond potentially wasted effort, with a little over-engineering, since it'll be hidden). If you overdo it on the putty, just press the parts together firmly and any excess should squish out the sides and can be trimmed away before it cures.