Cash/Counter sales invoice processing

Summary

Cash/Counter sales invoice processing

Content

In our retail segment of business we have direct(without any delivery order or sales order) cash and counter sales from the showroom. We don't maintain any customer master in the system for counter sale . we have on an average 1000 customer invoices per day . so it is difficult for our data entry operator to enter all the details which is required for creating manual customer invoices and create invoices. Also upon sale, inventory should get reduced automatically.

Any ideas, suggestion on how other companies are managing/doing this.

Thanks!