API insert new table

Hi:

    I can use the API to create a dataset, I then create 1 table inside the dataset while creating the dataset. I can use the API to load data into my dataset.

    I now want to create a new table inside the dataset. 

   I tried to post to  https://api.powerbi.com/beta/myorg/datasets/<<my long dataset id>>/tables

   I have also tried to recreate my dataset - but then I get a new dataset with just the new table.

  If posting to https://api.powerbi.com/beta/myorg/datasets :creates a new dataset,.

                      https://api.powerbi.com/beta/myorg/datasets/<<my long dataset id>>/tables/<<my table>>/rows : creates a new row, then I thought it logical that https://api.powerbi.com/beta/myorg/datasets/<<my long dataset id>>/tables would create a new table.

?