Short answer, yes.
Slightly longer answer, boot WinUAE with the 3.1 Install ADF and a Windows directory mounted as DH0 which contains the lha self extractor and your lha archive that contains your bootable system partition files, open a shell and from RAM: do C:protect DH0:lhasfx.run +RWED, type lhasfx.run, then type lha x dh0:nameoflhaarchive.lha
Eject the ADF and rest winuae et voila.
ps The lha self extractor may not neccessarily be named lhasfx.run, you'll have to check aminet for it.
