You can actually do this in drawing mode. On the menu bar for the tree, Click Show > Model Tree if it is not already selected. Next, select Settings > Tree Columns. In the Model Tree Columns Window, select Type > Model Parameters in the pulldown. Type PTC_COMMON_NAME in the "Name" field, and add it to the "Displayed" Area with the "add" button. Now each part in an assembly will have its associated common name in a column next to the part name. Just click on the common name and edit as needed.