Route planning withou target

Hello, I am new here. Although i have tried the search function i didnt find an answer.
I want to plan a route. I would like to set the start point and then without setting a target/destination point plan the route step by step (waypoint/shaping point - point by point). As the route develops this way i can fix the route (adding shaping points) or stop the routing when i feel that it is long enough (and continue on a new route). Is this way of planning possible and how do i do it?

Sure you can do that:
right click on any position of the map and “set start”, afterwards as many further right clicks and “extend route to”:
image

Thank you very much. Sometimes the answers are to simply to find them.