It is possible to show one and the same process in several places on other pages/drawings. It requires that the process already exists. It is easily done in the following way:
Create the box in the relevant page/drawing
Right click on the box and select “Edit”
Scroll all the way down in the window and click in the "Process" field
Click it until you find the relevant process and select it
Click “Save”
Publish the page/drawing