Payments received for the services provided in previous periods.

Payments received for the services provided in previous periods.

Hi Zoho.

Significant part of our business is providing the maintenance services for the s/w sold (or subscription for s/w). Some of our clients use postpayment option. Let say 31/12/2020 they will pay for 12 months of services provided in 2020.
Instead of putting the whole received amount in 12/2020 we would like to recognize as a revenue 1/12 of it each month. What would be the proper way to reflect it in Zoho.books? Do you have any special type of document for the services provided/accrued revenue but not invoiced yet? can we link it later on to the invoice?

Similar question on expense side. Let say I pay my office rent once per Q. How should I put 1/3 of it each month to the expenses?

thanks you in advance,
Alex