Connecting a Practice to the Parent Organization is also very simple.
Navigate to the agreements tab and click New Agreement.
You will notice a new drop-down menu below the company name field called the Parent Account field. 
This time, you will choose the DSO/Organization as the parent and NOT Legwork. Because this practice is a child account to the organization’s parent account.
Fill out the agreement from there like any other agreement and send for signing.
Once Signed, the Child account will be able to be accessed and logged into from the Parent Organization’s account as well.