The difference is:
Adding to Wall Type properties "embeds" the Profile into the wall, and it will be "permanently" located in the wall assembly.
Adding a Sweep manually allow you to place it and drag the ends manually.
To create a Sweep and manually place it:
Make sure the Profile Family is loaded into your Project--look in Project Browser, under Families>Profiles.
Then use Architecture Tab> Wall> Wall: Sweep
Under Type select Duplicate, give your sweep a name, then under Properties>Profiles, select your Profile from the drop-down list.
Then place cursor along edge of wall and hit enter. the sweep will attach itself to the wall. Youc an then drag the ends of the sweep manually.
Cliff B. Collins
Registered Architect The Lamar Johnson Collaborative Architects-St. Louis, MO