reyan01 - Unfortunately you are missing the point.
The OP is asking about creating a custom map for use in a foundry mission that he's creating that looks like the Deep Space K-7 (Sherman System) Map used before entering the ground social zone but available to be customised, and altered for specific reason.
As to the OP, I don't know every map that is available but
if you can't find it in the pre-made map list as Sherman System, K-7 System, Deep Space K-7 System or any appropriate derivation.
Then you might still have a chance of creating a map like that system. You might be able to create a custom map and update the backdrop to use either a K-7/Sherman preset (if one exists) or in the worse case scenario take a few screenshots and approximate the system as much as possible that way.
This does not include assets such as any planet or station but I know the K-7 station is an asset that you can use and you can also approximate any planets by dropping one of the planets onto the map.
I'm looking for the Sherman System (Deep Space K-7 space map) but can't find it anywhere. Have I missed it? Or does anyone know how best to do it from scratch? Thanks!
Unfortunately, there is no K-7 stock map. If you want to see how I integrated K-7 into my game, in Episode 5 "War Plans" of ST: Odyssey, you should check out the mission. Basically, you need a planet, some asteroids, some ships for traffic, and K-7, itself. K-7 is available as a model in the Foundry.