A family of Microsoft word processing software products for creating web, email, and print documents.
What you could do is to put the lot into a single-cell table cell of fixed height and width, with just a right-aligned tab-stop where you want the underlining to end within the cell. That also means you'll only need a single tab character per line. With that setup, any tabs pushed out of the way will simply scroll out of view.
To create a single-cell table with a fixed height and width:
• For the rows, set the exact row height under Table Tools>Layout>Properties>Row>Specify Height>Exactly.
• For the columns, set the preferred column width under Table Tools>Layout>Properties>Columns and uncheck the 'automatically resize to fit contents' option under Table Tools>Layout>Properties>Table>Options.