In IBI Go you can change you start location such that you start your delivery route from a fixed location. Read below how to set this up.

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Press Current location, to open the start location menu.

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Press Change start location, to open the menu where you can change the stat location.

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Turn Use fixed start location on and give the address you would like to start your delivery route from.

IBI will now use this address as starting point of the delivery route.