On the Job Preferences dialog, you can define values of priorities (importance of elements) assigned by default to individual components of a structure. You can change these values as you define structure elements.
A priority is a value that lets you manage interpenetration (cutting to fit) of structure elements that overlap with each other. The priority determines importance of an element in relation to other elements in a model as you create plans and sections. It also affects calculation of volume and area of formworks of materials used in a structure.
Elements with a lower priority value are cut to fit elements with a higher priority; the higher-priority element does not change. The drawing below illustrates interpenetration of a wall with a priority of 30 and a beam with a priority of 50. The priority of the beam is higher, so the wall is cut to the defined beam.
When elements have the same priority value, the element that was defined first is treated as though it has a higher priority. This is illustrated in the drawings below (for two walls).
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Element A defined first  |
Element B defined first  |