This dialog box appears when CC3 wants to know how and if you want to add or take entities away from your selection.
And
Restricts the selection. When you choose And, CC3 displays the Entity Selection dialog box again. Now you can add another set of selection criteria, telling CC3 to perform the editing operation only on entities that pass both the first test and the second test. For example, you could select Layer "STRUCTURES", then And, then by Type: Line to edit only lines on the "STRUCTURES" layer.
Or
Adds to the selection. When you choose Or, CC3 displays the Entity Selection dialog box again. Now you can add another set of selection criteria, telling CC3 to perform the editing operation on entities that pass either the first test or the second test. For example, you could select by Window, then Or, then by Window again to edit entities in either of two selection rectangles.
Not
Restricts the selection. When you choose Not, CC3 displays the Entity Selection dialog box again. Now you can perform the editing operation on all entities that pass the second test. For example, you could select by All, then Not, then Window to edit all entities outside of a window.
OK-Do It
Tells CC3 that you are satisfied with the selection and wish to continue with the editing operation.
Cancel
Cancels the selection process and the editing operation.
Help
Displays this on-line help topic.
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