Set up a summary report using a layout based on Enquiries data.
A sub summary part "when sorted by" product can group the entries by product and summary fields placed in this part can display subtotals for that product. You can perform a find to find the records for the desired date or dates, then sort by product to see subtotals for each product.
I recommend you to have a look at this video
to learn more on how to create Sub Summary reports in FileMaker. If you then like to learn more, There is free FileMaker Training Series for you to read