Use Tee to create a closed T-shaped spline. You can specify the radius of the two interior corners between the vertical web and horizontal flange of the section.
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Create panel > 
(Shapes) > Extended Splines > Object Type rollout > Tee
Example of Tee
(the middle mouse button) or scroll with the mouse wheel. To orbit the viewport, press and hold the 
key and drag with or scroll with the mouse wheel. Procedures
To create a Tee spline:
- Go to the Create panel and turn on (Shapes).
- Open the Shapes List and select Extended Splines.
- Click Tee.
- Drag and release the mouse button to define the initial size of the tee.
- Move the mouse and then click to define the thickness of the walls of the tee.
Interface
Rendering and Interpolation rollouts
Most spline-based shapes share these parameters. For details, see Rendering rollout and Interpolation rollout.
Creation Method rollout
The Tee shape offers the standard creation-method choice: Center or Edge. For details, see Creation Method rollout.
Keyboard Entry rollout
Creates a Tee spline from the keyboard. Use the X/Y/Z settings to specify the center point, and the remaining parameters to specify the dimensions, then click Create. After creating the spline, you can use the Parameters rollout controls to adjust its settings (see following).
Parameters rollout
- Length
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The height of the vertical web of the tee.
- Width
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The width of the flange crossing the tee.
- Thickness
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The thickness of the web and flange.
- Corner Radius
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The radius of the two interior corners between the vertical web and horizontal flange of the section.
Note: Take care when adjusting these settings. There are no constraining relationships between them. Therefore, it's possible to set a radius (Corner Radius) that is greater than the length of the web or width of the flange.