If you want to have an infinite supply of an item, place down Inifinity Chest (it's in the "question mark" category in Entity Editor) and set its filter to the item you want (artillery shell) and set how much should be kept in the chest inventory. As you take out items out of it, the chest will respawn new items to fullfill the filter settings. So then you can Ctrl + click the chest and top up supplies in your inventory instead of having to pickup items from ground.
Also, did you know you don't need to save scenario and create new map, you can just type /editor in the chat/console and it will switch you to character mode? Type /editor again to switch back to editor mode. This also works in your existing saves (will disable achievements). Or you don't need to bother with switching to character mode, you can setup inserter to feed artillery turret from infinity chest and unpause time in the editor mode.
We make the editor for ourselves to develop the game. During ...
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