Sounds like you want to add more propane tanks to your system. All tanks should be "feeding" the regulator i.e. tied in ahead of the regulator. All "users" i.e. BBQ, stove, oven, refer, water heater, space heater are tied in after the regulator. If that is what you want to do then simply "tee" into the supply side of the regulator (same side as existing tank(s)).
If you plan on only adding the tanks to your system once you stop you will need to have a valve in the line to the extra tanks or be sure to never open the valve(s) on your regular tanks unless the extra tank is connected.
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