IT Servicemanagement (WebUI) - Add Textbox

Hi experts,

in IT-Servicemanagement (solman 7.1)  there is the possibility, to enter texts (like description, reason, answer, ...).

In default there is only one text-box available and there is a button on which you can select the text which you want to enter.

I would like to add now a second text box.

So when I click on create, that there is one textbox for "Description" and one for "Reason".

Can somebody please provide me a guideline or explain how it works?

Thank you