Sphere Worlds

How do you remove them for cargo and supplies?

I haven't gotten near sphereworld creation yet but do you need to fleet up your ships and then give the create command to the fleet? Maybe selecting one ship doesn't show the program you've gotten all the prerequisites along for the ride.
Omnius

Your sphere world generator has to be on something that has some movement. Essentially you build everything in the one hex and then the sphere world generator gets ordered into the middle of the star which creates the world.

You dont need to fleet the ships. Dantes suggestion will work for you. Colonising them is the hard part. If I remember take a Rock Colony ship and hit the colonise button and then select hexes on the edge of the world

to create one just have everything right next to the star (I just use all baseships for eash) then select ONLY the baseship with the core piece and the stellar manipulation button should toggle click that and it will show the create sphereworld button click that and then click on the center of the star.

To colonize the result you generally have to first get the colony ship TO The sphereworld then once it arrives choose colonize and the hex it's in. (in other words select the colony ship, click on colonize, click on the sphereworld anywhere, wait til the ship arrives, select the ship and hit colonize then select the hex the ship is in.)

that could be... I have always put my stars in dead center of the system just to be safe