assign debits and credits to customer's accounting entries?

Hi,

we need to know if there is anyway to assign automatically debits and credits to customer's accounting entries but taking into account we need this for internal documents, this means we need this documents to don´t travel to tax authority to be approved but to be send to out internal system to balance current accounts of customers. We are not sure if this is possible to do.
We tried creating a new transaction source in order to generate automatic numbering sequence but as transactions needs to be completed in order to be send to internal system and balance current customer accounts, this will cause this transactions also be send to tax authority and we don´t need that.