If all you want to do is move the target for the share, and not the data, then this is easy:
cifs shares -delete share1
cifs shares -add share1 /vol/vol1 <options>
cifs access share1 <ACLs>
where <options> are the share options for the existing share1, and <ACLs> are the current ACLs for share1. You may need to remove the default "everyone/full control" ACL on the new share1.
When you access the new share, you'll see the share1 folder, and in that you'll see the data you usually see at the old share.
If you want to move the share and have it look the same, you'll need to migrate the data up one level, then change the shares.
Hope that helps