Some Tournaments will require you to submit army lists for review prior to the event while most will only make this available to assist you and your Opponents' Tournament experience. Either way where a Game System supports it you can create any number of Army Lists using the simple Tourn.ee List Builder tool.

You do not have to be attending a Tournament to make use of this tool.

We are working to integrate BattleScribe for list building as it is far cleverer than this tool; at some point Tournaments may require lists be built using that system to help with the frankly horrible task of list checking.