What the heck is the reason for buttons that do absolutely nothing?????
And Why does the Site Designer tool add layers to Revit???? I can understand 1 per type of object, but this is ridiculous!!
Charles Berteaux Iv
EDT BIM/VDC/Technology Department Manager | SSOE Group | Hillsboro
www.ssoe.com
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All those seemingly identical subcategories are clearly a programming problem.
As for the grayed out Delete button, that button will only be active if all of the selected items are unreferenced in your model. At least one of the selected SW Parking Lot subcategories must be in use (perhaps all are).
I agree David!
This Siteworks issue (all the multiple subcategry lines SWXXX) has been escilated to Autodesk.
For now I am just going to have to manually Delete them all by hand 
Charles Berteaux Iv
EDT BIM/VDC/Technology Department Manager | SSOE Group | Hillsboro
www.ssoe.com
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We basically built a script to handle all this nonsense....
Code is here for anyone interested:
#select a detail/model line first
selection = list(__revit__.ActiveUIDocument.Selection.Elements)
if len(selection) > 0:
el = selection[0]
styles = el.GetLineStyleIds()
if len(styles):
t = Transaction(doc, 'Delete all SW Lines')
t.Start()
for s in styles:
el = doc.GetElement(s)
if el.Name[:2] == 'SW':
print ('Line Style Deleted:\nID: {0}\tNAME: {1}\n'.format(el.Id, el.Name) )
doc.Delete(s)
t.Commit()
Charles Berteaux Iv
EDT BIM/VDC/Technology Department Manager | SSOE Group | Hillsboro
www.ssoe.com
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Thank you for creating a script which automates the deletion process.
This is a known issue which is logged with our Development Group. We are currently investigating a possible resolution, but the permanent fix requires the code for the Site Designer add-in to be changed, and as such we do not have an immediate fix.
Once we do have an immediate fix, we will post it as an update to the article below:
Revit: Thousands of new Linestyles show up in project
