Strictly speaking the team that wins the playoff between 11N and 11S has the right to be promoted. Realistically though for div 10 any team can apply to go up a division if they have good reason to, as usually there will be a couple of drop out teams which create a few spaces, and if it looks like you'll be competitive it'll usually be agreed without challenge.
Typical reasons to support promotion include:
- won a lower level Junior Championship (e.g. E or D)
- finished in the top 2 of the league section with a high win ratio (e.g. only lost once to the team that finished first, or didn't lose at all but lost the play off semi final or final)
- amalgamated with a higher division team but want to compete at a lower level as unliely ot be able to compete at a higher level (e.g. a club with a Div 7 team and a Div 11 team, Div 7 team folds and amalgamates with Div 11 team, not stong enough for 7 but easily strong enough for 10)