Summary
you can create assessments that appear on the Course Content page but don't require students to upload submissions. You can add instructions, files, a rubric, and goals so students can prepare for the offline work. This article will who you how to create this type of assessment.
Body

1. When creating a new assignment, click gear icon to the right of "Assignment Settings":

2. Under “Details & Information”, click the checkbox next to “Collect submissions offline”:

3. Click “Save” at the bottom of the Assignment Settings window:

4. By default, the assignment will be hidden from students. Customize the visibility settings in the dropdown menu in the top right corner:

When students open the assignment, Blackboard will inform them that the instructor will be collecting submissions offline, but their grade will still be accessible online:
