A player will only use 2-3 flasks for a raid, but could easily use 20+ potions for example. Each group would have min/norm/max based upon differnt % of crafting cost, and then each group would be using that pricing operation but for the different quantities and stack sizes.

Alchemy for example, you would have sub-groups by expansion (or just current expansion only to be honest for 99% of the items), and then sort into groups such as combat potions, flasks, utility potions, follower equipment. Im not very good with making TSM groups so I always used some imported strings to make them (transmogs, glyphs, food etc). Set up your own groups what what stuff is, and how much of it you would post at the same time. Looking for some TSM 4 groups/operations strings.

Look at the TSM Price Sources to see what you can use to base your prices.

More often than not, you will have a bunch of items post at prices that don't match your server's market, costing you profit or preventing sales at all. Realm population makes a huge difference in how you want to set things up, or they have price sources based upon their playstyle (like depending on certain shuffles for cheap enchanting materials). Importing is useful and awful at the same time for a beginner.

Tradeskillmaster strings