To see bills and transactions from previous days using BUSY, you can access the cash book report. The cash book report will show you a summary of all the transactions for each day, including bills and payments. BUSY offers a variety of reports related to accounting, inventory, GST, and more. You can access these reports from the Display menu and choose the one that meets your needs. You can also apply filters, sorting, and grouping options. You can also export the reports to different formats, such as Excel, PDF, etc.