You might to have a look at this post I have put up on Weldment profiles.
I show how to download and how to set up as well as Custom Profile
Use the copy settings wizard in solidworks tools. Save your settings using copy setting wizard from the 2015 menu, then apply them using the same tool from the 2016 menu.
On the Task pane, go to Design Library Tab > Solidworks Content > Weldments. Ctrl & click on an item to download a zip file. Unzip the file in "C:\Program Files\SOLIDWORKS Corp\SOLIDWORKS\lang\english\weldment profiles" and you will have a complete list of structural members.
Went from SW2014 to SW 2016 and all my custom profiles went missing. Adding file locations to System Options--File Locations--Weldment Profiles failed to restore these items in the weldment menu. They appear in the Design Library, but so what?
I added my custom profile to
C:\Program Files\SOLIDWORKS Corp\SOLIDWORKS\lang\english\weldment
this worked OK.