how to store multiple torpedo solutions?

[astat333]

now that i'm here, i may just as well ask a question that has been bothering me ever since i was playing SH3:

i understand that u-boat captains used to preset multiple torpedo solutions, then fire them all off in a quick salvo and immediately DIVE DIVE DIVE!!
i've never learned how to perform this tactic in SH3. i can only calculate the angle for a distant target and fire a slow torpedo at it - then target a nearer ship and quickly get another fish out before they all go at me.

what i want is my TDC to remember any setting for each selected torpedo individually. that is, if i set some distance, bearing and speed coords for my aft torpedo, it should store these settings even if i calculate other data for a frontal torpedo. so after coming back to my aft torpedo, i'd basically merely have to update the current bearing as given by my periscope and maybe, if i have the time, adjust the AOB.

i guess my problem is due to confusion with using both notepad and TDC to some extent?

how is it done for advanced sub captains? surely there must be a way and i just haven't found it yet in the tutorials and wikis.