In
the UV Texture Editor, select the
UVs you want to copy.
In
the UV Texture Editor, open the Polygons
> Copy UVs to UV Set sub-menu and choose a UV set.
Notes
When
polygon UV sets are copied with history, the source UV set is linked with
the destination. Any changes made to the source UV set by using construction
history, will influence the copied UV set. To avoid this issue, delete
construction history after copying the UV set.