Yes! You can add a table template to an existing workbook. Just click +Create New > Table > Use Template, choose your template, and click Add to Workspace. [1]
For personal templates, you can also duplicate a table and move it to a separate workbook - this keeps the structure without the data for future use.
If you need any more help with using table templates in your workbook, please let me know. Would you like to share more about what you're trying to achieve or any specific issues you're facing?