If your club wants to play in competitions from more than 1 association or league, you can add those organisation on your Organisation Details page.
NOTE: before you can do this, your parent organisation must give you permission.
Hover over My Organisation and select Organisation Details.
In the bottom right corner, click in the field Also Plays in Competitions Run By These Organisations.
In the Associated Organisations box that opens, select the applicable organisations from the left and add them to the right using the arrow.
You can add as many as necessary. Click Save when you are finished.
NOTE: don't forget to click Save. If you close without doing so, your selections will not be saved.
You will see the organisation(s) listed.