Open up Millenium and search by Title or SuDoc number.
Verify that the bib record is the one you want.
Click on the Summary tab and scroll down to the last entry to check location, itype and volume sequence.
Click on the Attach New Item button.
Verify that the location and itype fields are correct. Change as necessary.
Insert volume number and wand in the barcode.
If prompted to check for duplicates, click OK.
Click on the Summary tab and move the new item by clicking on the Move button if document is out of proper sequence.