I know I have done this easily before, but can not seem to do it in sw2017
Old post but would help The ABC of Weldment Profiles in SOLIDWORKS
A lot of getting the weldment profiles to show up in the program is the folder structure you create and point the program to. This document goes over all if it (GoEngineer - Weldment Profile Packs).
In addition to the link posted by Ryan Dark, the second part of #8 at Frequently Asked Forum Questions may be of some help.
Retrieving data ...