The tools that appear on the sub-toolbar will depend on the type of imported object that has been selected. Although the tools are different for various types of imported objects, they behave similarly in the various modes. The general approach is to first select an imported point in the 3D or list view, then locate, assign, or mark an imported point on a photo.
One example sub-toolbar looks like this:
(here the tools are (left to right): Multi-point Select, Auto-advance to next object, Auto-drive, Highlight Selected Point, and Auto-assign by ID/Name.)
See Imports Sub-Tools for a list of these tools.
When in mark/pin mode any points in the
selected imported object that have already been marked/pinned will highlight in
green on photos, tables and in the 3D view. When a Multipoint Transform object
is selected, the Multipoint select 
tool provides
a mode to select or mark a point associated with the multi-point transform. The
drop down reveals the assignment and point auto-detect tools. If you have a multipoint imported object selected, click on a photo
to identify a point at the correct location for the selected imported point.
Selecting an existing point will assign that point to the multipoint selected
point. Use the Auto-detect tool to automatically mark and reference a feature
point on multiple photos (see Point Auto-detect
Mode, only available in PhotoModeler Premium).
When a Control Object is selected the Mark/Pin imports button 
will activate import marking/pinning mode. The drop down reveals the assignment, target marking and point
auto-detect buttons. If you have a control imported
object selected, click on a photo to identify the correct location (use the Locate Tool to identify the
position(s) on a photo) for the selected imported point. Selecting an existing
non-control point will convert it to a control point, clicking where no mark
exists yet will create a new one. Use the target marking tool to sub-pixel
mark a target in the photo. Use the Auto-detect tool to automatically mark and
reference a feature point on multiple photos (see Point
Auto-detect Mode and Locate Tool only available
in PhotoModeler Premium).
Note: Once control points have been imported, right clicking on an imported point in the 3D Viewer will highlight it in the Imports and Coordinate Systems Pane, allowing it to be marked with next left click. Once orientation is complete and the control points can be projected onto the photo(s) (see Photo Projections and Imported Objects Photo Visibility), while in marking mode, the right click mouse button can be clicked to highlight and select the associated control point in the 3D Viewer. Then once highlighted the control point can then be quickly marked with a left click, without having to select the item in the External Geometry view. Essentially the right click selects the control item, and the left click marks the associated control point.
When Pinned object is selected, the Pin Point
assignment tool 
provides a mode to select/ assign a point with the imported pinned
object. If you have a pinned imported object selected, click
on an existing mark to pin the selected imported point to the already marked
point. Once a pinned imported object has 3 or more points pinned to existing
3D points its position will be calculated, and the entire pinned imported
object will be visible in 3D.
Note that you can pin an object to
Surface Draw points such that the object sits on the surface – this
requires the assignment of two imported points to two Surface Draw points. This
is useful when the number of visible pin points in the model is minimal. The
imported file should be setup so the Z axis is the upright direction. Then,
when the first pin assignment is to a Surface Point that is drawn on a plane
surface, and the second pin assignment is to another Surface Point, the import
will be converted to the pinned coordinate system using just those two points
and the surface. This is especially useful for pinning vehicle laser scans to a
road scene based on two surface draw tire marks. That is, import a laser scan
of a car, and you can pin it to the road surface with just two points. When the
import is pinned to Surface Draw points, the import icon changes to the Surface
pin: 
. Once a third point is assign, the pinned import
is treated like a regular pinned import point cloud: 
You can also use the Assign button while in Select Mode. Select the imported point, and then the associated 3D point on a photo, table or 3D Viewer and click Assign.
See the Import Sub-Tools for specific tools you can use with pinned points.