The rules of Omaha hi-lo (or Omaha 8-or-better) are similar to those of standard Omaha. The only one peculiarity of the game is that the pot can be split between the 2 winning hands: the best high hand and the best low hand. These hands can be held by one and the same person.
To qualify for low, a player must be able to play an 8-7-6-5-4-3-2-A all can be used for low, any combo of 2 cards from your hole cards and any 3 from the flop, turn, river, cards only
A-3-4-5-7 will be a low hand 2-3-5-7-8 would be a low hand so you see any combo from A to 8 can play as a low hand but A-2-3-4-5 / 2-3-4-5-6 / 3-4-5-6-7 / 4-5-6-7-8 will play as a low hands aswell as a hi hand if no other player as hit a higher st8 or better ie flush, fullhouse, 4 of a kind, but 2-3-4-5-6 will still split the pot as best low hand if there is no one holding the A plus any other low card from 2 to 6 to make a better low hand