savegrid works doing these steps :

In the admin menu, view the grid list.
Find your new grid in the menu and click it twice. (aghost and teleporting to them works) It should open a menu.
Also note the Grid_ID for it.
In that menu, look for the server component tab.
In that tab, look for MetaDataComponent
Change both _entityname and EntityName to your liking to find it faster in the grids next time.

savegrid Grid_ID /Autosaves/You_Name_It.yml

Grid_ID = Press F3 and look at id while on the *custom* grid you made.
The game hates saving stock things that loaded during the booting.

It saves it here in your server data folder : SS14.Server_win-x64\data\Autosaves



To reload once the server is rebooted :

1: Go to Reach or the main station
2: F3 to look at map layer.
3: loadgrid ID /Autosaves/You_Name_It.yml
ID = map layer you want it loaded on.
4: Look for grid from the admin menu. You_Name_It
5:Then Server Components/R.Sh.TransformComponent/LocalPosition (NOT _LocalPosition) to a safe distance (F3 menu also show coords. While a ghost you can move where you want to spawn it and note the coords) but close to reach or the main station.
6: Go to it.