How to do a setting specific dataset w/in a general ruleset?

[R_Kane]

OK let me 'splain...

I have HL with the full d20 and M&M datasets.

I have been working on creating a sci-fi/Traveller setting using M&M rules and would like to set up HL to work for this by heavily modifying the M&M dataset by adding/modifying/deleting skills, vehicles, weapons, etc.

When I am finished I want only the setting specific items to be available when creating characters for that setting.

But I also want to keep the original M&M dataset intact for use in superhero games.

Before I totally screw up any data files I have now I thought I'd get some input in how to go about this.


Do I simply copy the 'mutants' subfolder in the 'data' folder into a new subfolder...'M&MTraveller'?

If yes, then how do I select this when starting up HL? Will a fourth game-system option be automatically available to select (currently d20, M&M, WoD are avail at start-up)?

Thanks in advance for any help!