AbnRanger
Thanks for taking the time!
I've finally watched the linked tutorial, it seems to be on track regarding where I'm needing to go - in other words leverage existing texturing as much as possible.
... which also answers your question concerning why do I want to retain UV's & textures from the HiRes model - basically to fast track model conversion from Hi to Low res, retaining texture assets as much as possible. True, I could fall back on unwrapping / re-creating seams etc., I'm just exploring if the thing can be done faster ... time is always of the essence :-)
But I do appreciate you taking the time, so thanks again!
Cheers,
VisMod