How can I work with a drawing that has both metric and imperial measurements?
First, setup your project for the units you want (inches or mm). Then, when you are provided a measurement using the other units, you can use the program's ability to evaluate mathematical expressions in the data input boxes to quickly convert the measurement to the needed units.
To input a measurement given in inches to its metric equivalent, you would enter the inch value in the data input box, followed by '*m=' (without the quotes). For example, to enter 3 inches in mm, in the data input box you would type '3*m=', again without the quotes. As soon as you press the '=' key, the input value will change to the metric equivalent of 76.2 mm.
To input a measurement given in mm to its imperial equivalent, enter the mm value in the data input box followed by '*i=' (without the quotes). For example, to enter 130 mm in inches you would type '130*i=' in the data input box, again without the quotes. As soon as the '=' key is pressed, the input value will change to the imperial equivalent of 5.1181 inches.