Different Trajectory topic for move_base

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Hi, I just wanted to know how would I be able to replace the default trajectory on move_base package to a custom trajectory path topic that I wrote. If I change the topic on path from rviz to my own topic and use move base to move the robot the robot will not use my path, it will use the default path but the difference is that it just shows my path but in the back-end follows the default one. So I guess it is not that simple. Anyone can give me some guidance? Thank you.