Is it possible that H9 will control Timeline? At the moment, H9 sends the tempo to Timeline, but I also want to change my presets, for example … if I change the preset in H9 to no. 5, I want Timeline to change to pr. no 5. How to do it if possible? I note that I know very little about midi. Thanks

Yes, you can just turn on H9's Program Change Transmit in its MIDI setting. The user manual clearly describes how you can set that.