When a LF is created, the specific members which are to be included from the PF are identified.
Do you want one LF over all members in the PF, or multiple LF; one for each member in the PF?
If it is one LF for all members, you have 2 choices.
1. Recreate the LF everytime a new member is added to the PF.
2. Change the PF to be a single member file. Since you wanted these in single members, you would probably need to add a field to identify which the old distingushing break for members.