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Line Profile GD&T (often called Profile of a Line in the standards) is typically used to vary the location of a planar or curved surface. It can also be used to vary the form of a surface or the size of a Feature of Size. Note that even though in ASME or ISO a Profile of a Line GD&T is controlling location, orientation, and form, in 3DCS it is only controlling location. For this reason, it may be necessary to add refinements to the GD&T that are not on the drawing. Also note that even though a Profile of a Line GD&T callout is meant to specify the variation along lines of a surface, because 3DCS is a 3D solution therefore the entire 3D face will receive the variation and fall within the allowable zone instead of just line segments in one direction.
Creating Line Profile Procedure:
1.In the GD&Ts dialog, select Line Profile in the drop-down list and select [Add GD&T]. This will open up the GD&T dialog.
2.Underneath the Features list, select [Add].
3.Select the feature(s) whose location (or form) should be varied by this GD&T.
4.Click [OK][Close] in the Pick FeatureSelect dialog
At this point the GD&T dialog will pop back up. Notice that the features selected are now in the Features list in the top half of the dialog.
5.Enter the range in the text entry field.
6.Select No DRF, a DRF, or From Nominal from the Datum Reference Frame drop-down. See Datum Reference Frames for more information about creating and using DRFs.
7.Select [OK] to exit the dialog and the save the GD&T.
How this GD&T Varies the Feature - DRF or From Nominal:
A Line Profile GD&T with a DRF or From Nominal selected is the most common use of the Line Profile GD&T. The Line Profile GD&T only varies the location of the feature which means that the orientation and form of the feature remain perfect. The location of the feature is varied within the specified zone. The direction of the zone is determined by the direction of the surface selected. If the surface is not planar then each mesh node on the surface will vary along the direction normal to itself. An example of this is displayed in the second image below. If a Line Profile GD&T is applied to a Feature of Size such as a pin or hole then the diametrical size of the feature will vary while the axis remains unchanged relative to the DRF. This is shown in the third image below.
A few sample features with how a Line Profile GD&T would commonly deviate them are shown below.
Note: While only a few deviated locations are shown below, the actual variations will use the entire specified zone.
A side view of a face with a Line Profile GD&T applied to it set to either a DRF or From Nominal.
A side view of a curved surface with a Line Profile GD&T applied to it set to either a DRF or From Nominal.
A pin with a Line Profile GD&T applied to it set to either a DRF or From Nominal.
Any feature will work with a Line Profile GD&T.
Note: While size is varied for a pin or hole feature using the Line Profile GD&T, this will not be taken into account for Bonus Tolerance or Datum Shift in any other GD&T. See Bonus Tolerance and Datum Shift for more information.
How this GD&T Varies the Feature - No DRF:
A Line Profile GD&T set to No DRF will control the form of the feature(s) in the Features list. As 
Flatness or 
Straightness cannot be applied to a curved surface, this is the only option for applying form variation to any curved surfaces. When deviating form, each node on the feature will deviate independently of all other nodes on the surface. This differs from the location tolerance because the location tolerance is deviating all of the nodes together. When applied to a a feature of size such as a pin or hole, the size will vary independently at each cross section of the feature, but the axis will still remain perfect. This deviation style is identical to how 3DCS treats 
Circularity, 
Cylindricity, or Straightness (linear zone on a pin or hole). An example of this is shown in the third image below.
Sample features with how a Line Profile GD&T set to No DRF would commonly deviate are shown below.
Note: While only a few deviated locations are shown below, the actual variations will use the entire specified zone.
A side view of a face with a Line Profile GD&T applied to it set to No DRF.
A side view of a curved surface with a Line Profile GD&T applied to it set to No DRF.
A pin with a Line Profile GD&T applied to it set to No DRF.
Rate of Change/Unit Basis:
For a Line Profile GD&T set to No DRF it is possible to use the Unit Basis section of the Options tab. See Unit Basis for more information.
Unsupported Case - Multiple Line Profile Callouts on One Feature:
It is possible that on a drawing there will be separate Line Profile GD&T on the same surface for two separate drawing views, implying different variation is allowed on the surface depending on which direction the check is being performed in. This is an unsupported case for the Line Profile GD&T in 3DCS. An example of this case is shown below.
This case is unsupported by the Line Profile GD&T in 3DCS.