Just like Google Sheets, you can create and add multiple tables in your document on Google Docs and customize them with your own style and size. When working with tables in a Google Docs document, one of the tools that you can use from time to time is the merge cells functionality.
How to Merge Cells in Google Sheets Tutorial
If your table already contains cells that have been previously merged, the following message will help you unmerge them so you can enter different information into separate cells.
The Google Docs web app is perhaps the most convenient way to edit documents you create through the service.
You can also unmerge previously merged cells using the Google Docs toolbar at the top.