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In the Groups tab, click Create a new group.
It has a different prefix and color than the default group.
You can modify the prefix, start number and color of the group.
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In the Elements tab, select
several rebar layers.
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Click Add to group.
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Select the group you created.
You moved layers from the default group to the group you added.
Note:
You can modify a group by changing the prefix, start number and color of the group. Numbering is affected by the modification of start number.