How do you enter numbers on a Mac when making a cellular voice call with iPhone? I just upgraded to Yosemite, and sometimes perform outbound cellular calls from my Mac using my iPhone. However, if I call a company that has a phone menu I have to enter specific numbers to choose from those menu options. 

Is this possible, and if so, how can I do this?
Yes, it is possible. Numbers can be entered using the keyboard. The correct tones will be produced and transmitted on your Yosemite Mac.