How to make subfolders?

Hello, I’m new to Grist and find it really great. I install to try on my mini debian server with docker.
I want to make table for my small company where I will put my deliveries. I want to make Page:

Transport:
      -  2022
              *  January
                            and here I will make Table:
                                Loading | Loading Data | Delivery to | Driver data | Shipping Company | Goods | Price |
              * February
                              ..........

etc.
I cant find how to make that structure in docs. Can somebody will be kind to help me?

Regards.

OK, figure out after few tries I drag tabs as subfolders.

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