Now let's get on with it:
I have color-coded them to make it easier to connect the dots.
STEP 1: CREATE 3 NEW ACTORS IN YOUR DATABASE
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I named mine 'LOCATION 1', 'LOCATION 2' AND 'LOCATION 3' so that when you open the name-input processing window it shows up, even when there is no location saved yet.
STEP 2: MAKE AN ITEM IN YOUR DATABASE.
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Make sure you match the boxes in yours with what I highlighted, the name can be anything you want.
Be sure to use the 'Effects' box to call your common event. Mine is named 'TELEPORTER'.
STEP 3: CREATE 9 VARIABLES
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It is 9 total variables total but it's easier to look at it as 3 variables each for 3 locations, as follows:- Location 1
Var. 1. Map X
Var. 2. Map Y
Var. 3. Map ID - Location 2
Var. 1. Map X
Var. 2. Map Y
Var. 3. Map ID - Location 3
Var. 1. Map X
Var. 2. Map Y
Var. 3. Map ID
STEP 4: MAKE YOUR COMMON EVENT
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