Here's how you can do it:
1. Place a Prefixer to the right of your second LFO (multiwave) in the signal flow
2. Select LFO (multiwave); from the Action menu, select Add VCS Layout
3. In the Prefixer specify a prefix or suffix for the second !ModShape control
For more than two copies of the LFO, you could use the Replicator and follow the same three steps.