Edit BLOCK Listing AutoCAD 2000

Hello Folks,
I wish to know how to edit the BLOCK listing in AutoCAD 2000.
Scenario: I have progressed into a design on AutoCAD 2000, and reached the point where I wish to detete items from the listing of BLOCKS because these line items:
- are of no further use in this design exercise,
- or I have decided to change the name originally given to a BLOCK, in which case I am left with the two line items in the BLOCK listing, the original name and the changed name.
How do I go about deleting unwanted line items from the BLOCK listing in AutoCAD 2000?
 
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