After transitioning to a newer version of NX, Users are not able to use Offset and select the edges of the solid body in the part while in the sketcher.
SolutionWhile in the sketch, change the Selection Scope option from "Within Active Sketch Only" to "Within Work Part Only" and the User will be able to select the edges.
There is a customer default setting for the Selection Scope to be "Within Work Part Only". When new version of NX was installed the customer default settings were not exported from the previous version and imported into new version of NX and this setting was most likely toggled OFF by default.
Go to the Customer Defaults --> Sketch --> General --> Session Settings (tab) --> toggle OFF, [Use "Within Active Sketch Only" Selection Scope]. Then restart NX.
Reference document ID: 001-6874169