Yes, you can insert a paragraph break within text in a single cell in Excel. Here's how:

1. Double-click on the cell where you want to insert the paragraph break.
2. Place your cursor where you want the paragraph break to occur.
3. Press the "Alt" key on your keyboard and, while holding it down, press "Enter". This will insert a line break within the cell.
4. Type in the text for the next paragraph.
5. Repeat steps 2-4 for each additional paragraph.

Alternatively, you can also use the keyboard shortcut "Ctrl + Enter" to insert a line break within a cell. This will allow you to quickly add multiple paragraphs of text within a single cell.

By using these manual commands, you can easily insert paragraph breaks within text in a single cell in Excel. This will help you to keep all of your text in one cell and make it easier to manage and organize your data.