Assembly Sequence PropertyManager
The second step in creating a TolAnalyst study is to define the simplified assembly. A simplified assembly includes, at a minimum, the parts necessary to establish a tolerance chain between the two measurement features. This step also establishes the sequence or order in which you place parts into the simplified assembly, which TolAnalyst replicates when computing the worst case conditions.
Assembly order affects results.
To define the assembly sequence:
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Select a Base part
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Add parts to the sequence using either method:
As you select bodies, the display state of each part and neighbors list updates. When the selections are sufficient to establish a tolerance chain between the two measurement features, the message box turns from yellow to green.

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Click
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To delete a part from the sequence, select it under Parts and Sequence and press the Delete key, or right-click and select Delete. All subsequent parts are deleted from the sequence.
PropertyManager Options
Tolerance Assembly
Base Part. Defines the first DimXpert part in the simplified assembly. The base part selection is fixed and sets the origin of measurement for the evaluation. 
When you select the base part:
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The base part is given a designated color.
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All neighboring DimXpert parts are made translucent.
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All other parts are shown in wireframe.

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Assembly before selection
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Assembly after selecting the base part
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Components and Sequence. Defines the remaining parts in the simplified assembly. Select the parts in the order reflecting the actual or intended assembly processes. 
Neighbors. Use this list as an alternative method for adding parts to the simplified assembly. The list includes parts neighboring the base part or pre-existing parts in the simplified assembly.
A neighbor is a part that has DimXpert data and whose bounding box overlaps that of another selected part in the simplified assembly. The two most common examples of neighbors are two coincident planes or a shaft passing through a bore with clearance.