The lines that have some kind of pricing condition code are stored in KONV. The subtotals that are assigned a Subtotal field in the pricing procedure (as mentioned by MoazzaM above) would be in VBAP table. The other subtotals are not stored anywhere in the database, they're just calculated as needed.
Also if you're an ABAPer then you might want to use SQL Trace before posting the data questions on SCN.