If you're talking about
installment plan or something like that: You bought somethings with credit, pay parts of money each period in a fixed time(like 6 months or a year).
I'm facing the same issue, I'm trying to deal it like this:
{DATE} open Liabilities:CreditCards:XXX:Bill
{DATE} open Liabilities:CreditCards:XXX:InstallmentPlan:MacBookPro:Principal ;;Pay within six months
{DATE} open Liabilities:CreditCards:XXX:InstallmentPlan:MacBookPro:Interests
{DATE} * "buy a new macbook pro with installment plan"
Expenses:CutMyHandIfBuyMore 20000 CNY
Expenses:BankEatMyInterests 2000 CNY
Liabilities:CreditCards:XXX:InstallmentPlan:MacBookPro:Principal -20000 CNY
Liabilities:CreditCards:XXX:InstallmentPlan:MacBookPro:Interests -2000 CNY
When my bill come, I append a new entry:
{BillDATE} * "Stage-1 buy a new macbook pro with installment plan"
Liabilities:CreditCards:XXX:Bill -4000 CNY
Liabilities:CreditCards:XXX:InstallmentPlan:MacBookPro:Principal +3700 CNY
Liabilities:CreditCards:XXX:InstallmentPlan:MacBookPro:Interests +300 CNY
Not sure if it'll work, but I think there're may better solution.