Rearranging text segments not possible in sequence

I can neither bulk delete filter words and pauses in the source footage, nor can I merge or split text-segments in a sequence. The only workaround for me so far is to export sufficiently large segments (like around 1h, the original footage is 4h), then reimport, transcribe, text-based removal or filterwords etc, then rearrange the due to the filter word removal messed up transcription segments. 

Is this supposed how it should be? Because why would the transcript segments be able to split up after deleting a part of it, like a filterword, etc,  but cannot be merged afterwards?