While in edit sketch mode, go to Tools, Dimensions, Fully Define Sketch. A property manager will appear on the left side of the screen where you can select to add dimensions and/or relations. Then give the sketch datums for any vertical or horizontal dimensions needed (this will use the part origin by default). Press the green checkmark and all needed relations and dimensions will be added to the sketch.
For further assistance, please contact our HawkSupport team at 877-266-4469(US) or 866-587-6803(Canada) and email@example.com.