Question

hi i know this may sound stupid but i just need to clarify some things with general ledger and the trial balance.
For example, i am given the post trial balance for ABC Ltd. These accounts which include cash, accounts receivable, accum dep... etc.., do i need to add on to these figures for the following month balance?
Eg. post trial cash account 1000 in september...... my general ledger says 6000 for october.. so does that mean 1000 + 6000? I'm sorry if i don't make sense, but i need some help! thanks