After spending 2 hours trying to figure this out and Googling with no avail, I decided to make a guide to ensure no one else had to spend the same amount of time.
The problem is not that these terms did not explain what to do, the problem is that the GALAXY EDITOR's search function does not work properly. If you type in "Behavior" into the search box, it will only bring up one behavior field that you cannot edit regardless of the fact that the term you are modifying is titled: "Behavior: Resource Drop Off +". The best way to find this is to select the unit you want to add the ability to return resources to any unit as a drop off point is to search specifically for the term "Resource", "Drop", or "Off" in the search bar of the table view.
I know this post seems unnecessary, but if it took me two hours to find this after taking college classes on how to search for information on the web... this sort of post is really necessary. I mean, just look at the search terms I used that didn't explain this to me?
Failed Search terms:
"SC2 galaxy editor behavior flags"
"galaxy editor how do SCVs know to return resrouces to a command center"
"Galaxy Editor Behavior - Resource Drop Off"
"SC2 Behavior: Resources drop off"
"MineralZ harvesting Galaxy Editor"
"sc2 galaxy editor getting a harvester to return cargo to itself"
Tutorial section is not for questions or complaints. If you were having trouble figuring out how to implement something, check the wiki or try a search on this site. In any case, this topic shouldn't have been made, at least not here.
For a start that it has a + at the end means you have not got the editor set to the correct guidelines. The search only looks for specific strings. Note it uses American spelling lacking the u in behaviour.
College It courses are like learning to hit two rocks together, they are meaningless in the real world.
Now to solve your issue. Under the Units data type the Behavior: Resource Drop Off field determines the drop off point.
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Contribute to the wiki (Wiki button at top of page) Considered easy altering of the unit textures?
Not sure if you figured it out yet. Take the harvesters unit data and find the 'Behavior: resource drop off' section and add minerals. the harvester will mine the minerals and then return it to itself and then continue harvesting.