Did you try? Alter should replace existing index.

>I need to affect existing indexes, not create new ones
>
>
>>Something like:
>>
>>USE databsename!tablename EXCLUSIVE
>>ALTER TABLE tablename ADD PRIMARY KEY fld1 TAG fld1
>>
>>See more on Alter Table in VFP Help.
>>
>>>Is there a way to do it?
>>>
>>>For Example:
>>>table1 has index1 and index2 (regular type)
>>>I need to change Index1 to Primary, and Index2 to Candidate