If you already have one or more connections in the Connections list, you can export them and then open on another device with Parallels Client.
To export a connection, do the following:
Open Parallels Client.
Tap the Share icon in the top left corner of the screen.
Select the connection you want to share and tap again.
Choose how you want to share your connection. It will be exported as a file with the .2xc extension.
To import a connection, do the following:
Open the email or cloud storage (or what you used to share the connection in step 4 above) on another device with Parallels Client installed.
Select the .2xc file and choose to open it with Parallels Client. The application will start and open the selected connection.