Firs of all, uncheck the Has portal on the other maps (if you dont wanna have the portals in cape) after that load some of the maps and create a new portal (Under objetcs in map maker)
Write the maps name under Gate Destination. Write numbers in X Y Z and Arrival Yaw, this is where you will appear if you enter a new map. Then click new gate.
Before you write the number there, go to the map you are making a gate to and zoom the camera to the place there you wanna appear and write the numbers from the box at the bottom on a paper.
Bleh, bad explanation, but yeah, I hopes you understood something of it xD