Login to Stock Manager as Super-User. Normal Users will not be able to carry out the right-click security feature documented here.
On the form that is to be constrained within Stock Manager right-click the component that is to be secured and pick the 'Setup Security' Option. Note that the 'Enable All' and 'Show All' functions are available to display previously hidden and disabled components.
On the left of the form pick if you are to apply by 'User' or by 'Group'.
Drag the Groups/Users to the Enabled, Disabled or Hidden sections as required for the component.
Click on Apply Group Changes (or Apply User Changes if working by User).
