Set the options for priorities at prefix modification.

| Option | Description |
|---|---|
| Unique mark per object | |
| Single part | Each single part gets a unique number. |
| Assembly | Each assembly gets a unique number. |
| Overwrite prefix: Optionally, some of the prefixes can be overwritten. Select the set of prefixes to automatically overwrite by the numbering process. | |
| Manual prefixes | Overwrites the prefixes set in the properties dialog box. |
| Prefixes set by external program | Overwrites the prefixes set by another application (e.g.Lisp). |
| Prefixes set by rules | Overwrites the prefixes set by a rule. |
| Reuse unused marks | The marks which were used in the past are never reused again. |
| Take released objects into account | The released objects are taken into account at numbering. |
| Use column orientation for assemblies | The columns with different orientation get different assembly marks. |
| Exclude bolts | The bolts are not taken into account at numbering. |
| Exclude anchors | The anchors are not taken into account at numbering. |
| Exclude connectors | The connectors are not taken into account at numbering. |
| Exclude concrete objects | The concrete objects are not taken into account at numbering. |
| Exclude timber objects | The timber objects are not taken into account at numbering. |
| Use geometry for preliminary numbering | If the same type of elements are geometrically different, they will receive different part numbers. |
| Allow changes of preliminary numbers | If checked, you can change the preliminary numbers. |
| Assign the same preliminary number to all parts from the same assembly | If not checked, the parts receive their own different preliminary number. |
| Exclude not marked as "Structural member" for preliminary numbering | Elements that are not marked as structural members in the Behavior tab of their properties are not taken into account at numbering. |