Deleting first characters of a text

Hello, I am trying to make a multiline text component which is updated with internal Nextion keyboard. I am trying to delete the first line of a text internally and slide the rest of the text on the upper side. I had some couple thoughts but I think without creating a solution for right-side-wise deletion it won’t work. Anyone got any ideas? Will be highly appreciated.

To remove the first part of a string is possible with substr, to find a delimiter (CR) is possible with spstr.
I’m not sure this is the only problem you want to solve.