The secret may be to click on an item, hold down the shift key while selecting the other items, KEEP HOLDING THE SHIFT KEY WHILE RIGHT-CLICKING, delete.
I'd hope the OP has found a solution prior to this after 20 years...!!!!!
neilyj (No connection with Autodesk other than using the products in the real world)
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I’m more impressed that there is a post from 2003. My memory is scant but I thought the software was a separate cd sent out with LDT in 99 and not officially rolled out until 2005…
Wow where has all this time gone
cheers