You can create your own scout assignments if you have the Scouting Responsibility assigned to yourself. You can assign this responsibility via the Scouting Centre by using the Scouting Responsibility panel or via the Staff Responsibilities screen under the ‘Set assignments for scouting team’ option.
Once you have the responsibility, you’ll need to navigate to the Assignments page from where you can select the ‘Create New Assignment’ option.
This will bring up the ‘Create New Assignment’ dialog from here you can select the position you wish to create an assignment for via the tactics pitch.
You can create an assignment for competition, nation, region, continent via the Scope dropdown in the top right hand corner of the dialog.