Restoring Recorded Changes
This section provides information on how to restore designs to a prior state using the Design History and Restore elements tools.
Design History supports several methods of recovering changes from prior versions. You can recover from a single version, perform a multi-select from several versions, restore by element, or use a combination of these methods.
Recovery is not limited to changes that have been made in a specific revision. Working on the model itself, any element can be directly edited or the element can be edited with the Properties and the Element Changes dialog.
Restoring a Design History from a Specific Revision
You can restore the state of a model to that of a prior revision using the Restore elements from history tool. This tool restores whatever you have selected to the state it was in at the time you choose. So, if you want a given element or area to look like it did just after you created revision 1.x, select element or fence the area, select revision 1.x, and place a data point.
The effects of the Restore elements from history tool are cumulative. That is, for example, if the current revision is 1.6, and you restore the history to revision 1.3, you will remove all of the changes from revisions 1.6. 1.5, and 1.4. In contrast, if you selected the changes in revision 1.3 in Design History and performed an Undo, the changes would occur only for the modifications made in revision 1.4, not for any of the subsequent revisions.
Restoring to a Revision with a Fence
You can recover from a single revision using a fence and the Restore elements tool.
Restoring Multiple Revisions (Undoing Historical Changes)
You can recover from multiple revisions. The general behavior is as follows:
If you select revision 1.x and 1.y and then select Undo, you will undo only the effects of those two revisions.
If you select revision 1.x and 1.y and then select Redo, you will reassert the effects of those two revisions, possibly overriding the effects of revisions that came later.
If you select all revisions after revision 1.x and select Undo, you will effectively roll the design back to the time just after 1.x.
Undoing Historical Changes from Multiple Revisions
You can recover elements from multiple revisions.
Revision Level Changes
Undo and redo can be applied to a single revision or to a set of revisions. You get one result by selecting a single revision and then invoking Undo. You get another result by invoking Redo, and still other effects by selecting sequences of revisions and using undo or redo. This information is intended to serve as a caution that these tools should be used with care.
In addition to using the Restore elements tool, you can also restore design data at a point in time using Design History and Undo.