The "right" way to work with these drawings in NX depends on the circumstances- how many you have to work with, and what you need to do with the drawings. Some options...
[ul]
[li](no need to edit) - viewable format such as PDF[/li]
[li](basic editing, no associativity) - translate via DXF or similar[/li]
[li](full editing, associative to 3D) - keep them in SolidEdge, manually re-draft in NX, or look at translators from companies like ITI TranscenData, Elysium, or Core Technologies[/li]
[/ul]
Good luck,
Tony