The DLFeatureLineToProfile command allows the user to link a Featureline to an existing profile.
Type DLFeatureLineToProfile at the command line and select a Featureline, or select a Featureline on-screen, then right-click and select "Dynamic Links" from the shortcut menu. You will then be prompyed to select the Profile to link to. This tool is intended to be used with profiles previously created using the Sincpac's CAPFeature tool prior to having the option to automatically add the link.
Create Alignment and Profile from existing Featureline with option to link created objects to the Featureline.