then can I at least choose which table is assigned to which class?
It's determined by their ID. Each class ID 0-5 shares their stats with their "promoted" counterpart 6-11.
If you want Warrior and Master to share stats, make Warrior ID 0 and Master ID 6.
Though if Master is the Warrior's counterpart for stats, he can't be the BW's counterpart for magic.
No, you can't really directly "assign" which classes get the stats apart from shuffling around their IDs. At least not with Hackster alone.
Though... if you can dig up a big enough chunk of free space, you can make an asm hack to give each class unique level up stats.