The depth chart allows you to specify who should be subsituted and in what order during a game. You can set four levels of players at each position (PG, SG, SF, PF, C). The players set at depth level 1 will be the starters in the game.
For each slot in the depth chart, you may also set Target Minutes, which is just a range of minutes that you would like that player to play per game at that position. If you set a player to 0 target minutes he will be likely to play only if no one else is available or if the game is a blowout.
During a substitution situation the SimEngine will rank each available player at each position by factoring in depth chart, minutes played compared to target minutes, natural position, and foul trouble. Then a large number of possible lineup combinations are considered to find the best possible 5 players to play at that point.
NOTE: You are only required to have depth level 1 set for each position