I got around to do Top-Down modeling. Thanks for the this forum. I renamed the main assembly V020620-E0001 to V020620-E0001 BELT FEEDER using Solidworks > Rename.

QUESTION:
1. Why the old file is still existing in the PDM folder? Ref. Figure-1
2. Why this old file is different from the new one. Please see Figure-2 below.
(For now, it should be the same.)

3. How can I delete files permanently in PDM vault. Please see Figure-3

I look forward to receiving help. Thanks.

Figure-1

Figure-2

Figure-3