FrontAccounting is big software but I need some customizations. What can I do?
First look in the Download pages if there are some of the extensions that you can use. If not, and you are a skilled PHP programmer yourself, you can write an extension yourself. Look into one of the existent extensions to see how this is done. If this doesn’t help, you can put a question on the Jobs Wanted / Offered Forum. Please be specific about what you want to be done.