Change requests are requests to execute simple changes to your plant within your company, or execute and collaborate on large projects with contractors using SDx Projects.
Change request pins are markup elements you can add to a markup layer to create a change request. The change request pin is linked to the newly created change request and is a graphical locator for the change request.
Pins are selected objects that you add to your Pinboard, so you can quickly access these objects to manage while you are working.