Or you could assign a specific sub-category to them and use object styles.
All of the options given here are valid. The best one will depend on your workflow and what exactly the project entails.
Linework tool could be the quickest upfront. But the time required can add up quickly if you have to do this in a lot of elevations.
Using visibility graphics would likely be a bit faster, but you'll have to do it to every view or use a view template. Depending on the category and what else you have modeled in that category, you may want to assign a sub-category to the elements for this as well.
If you have to assign the subcategory, you might as well just use the object styles option so its just the default in your project.
The choice is up to you!