You process a number of transactions in bulk by running an import for either your receipts or payments in bulk. Note that each is its own import. You can import both receipts and payments but you will have to do each separately. The process for both however, is very similar.
The process uses a csv file (a type of Excel file) which contains the details of all the transactions that you want to upload.
You can also build your own import specifications so that you do not have to alter your data to match the default import template that comes with Actionstep. See Bulk Import Specifications - Trust Accounting Administration for details.