We have 5 sales people who use to be 100% comission, but now as of this month they are getting a base salary and comission on what they sale. My question is now that they are getting a salary the times that they work should be determined by the comp

We have 5 sales people who use to be 100% comission, but now as of this month they are getting a base salary and comission on what they sale. My question is now that they are getting a salary the times that they work should be determined by the company and not by them, in other words, they are use to taking a lunch from 1 1/2 to two hours and not coming in at eight AM like all other employees, for example: The sales force is use to coming in say at 8:30 Am, leaving for lunch at noon until 1:30, then leaving at 3 PM. We would like to know do we have the right to tell them they now should be here at 8 AM, only an hour for lunch and we close at 5 PM ?