Default home system in custom map

Probably a bit of a noob question but...How do you assign a race it's default home system when creating a custom map?  E.g Terran home system sol, with Earth, Mars etc.. complete with textures.  Tried ticking the home system option but it always just displays the home system as a random star with random planets e.g Antares.  I'm guessing there's a way around this?  

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