Create and modify 3D models > Modify 3D geometry > Modify 3D geometry using dimensions > Symmetrically moving two opposite faces using linear dimensions
  
Symmetrically moving two opposite faces using linear dimensions
To symmetrically move opposite faces using a linear dimension,
1. Select the midpoint of a linear dimension. The visual feedback shows the 3D CoPilot with bi-directional arrows that you can drag to move the faces connected to the dimension. The Command Mini Toolbar (CMT) opens with Symmetrical Move as the default command.
2. Click the 3D CoPilot dragger and move the cursor or click on the CMT and move the cursor to move both the faces connected to the dimension. The Symmetrical Move dialog box opens.
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You can execute the Symmetrical Move command only by selecting a dimension in the viewport. The Symmetrical Move command is not available in the main task bar.
3. Click a point in the viewport to move the faces to that distance. You can also type a distance in the Symmetrical Move dialog box and press ENTER to move the faces.
4. Click Preview to see the impact of changes before accepting them.
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You can toggle between Realistic and Quick to see either realistic feedback or quick feedback when you move a face or a feature in the viewport. See Realistic feedback.
5. Click Next to finish the operation.
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You can click Chk & Fix if you suspect that a part is corrupt. Chk & Fix checks for self-intersections, knife edges, and void shells and attempts to fix them. If a part fails the check and fix, it is not modified and remains in its original state.
6. Click to complete the operation.