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Select the element that the dimension measures.
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Select a point for the dimension. This action adds the dimension to the dimension group.
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If you change a dimension group, the group updates automatically.
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If you delete a dimension from the middle of a chained dimension group, the group splits into two groups.
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If you place a dimension group using Axis and then delete the first or middle dimension from the group, this action deletes all the dimensions after the removed dimension.