Retag recalculates each selected primary component tag, and updates the related components. You can update a single component, a group of components, a drawing, drawings within your project, or the entire project.
Run Retag Components when something changes on your drawing or project that affects the component tags. It can include revising the ladder line reference numbers or changing the tag format. Retag recalculates each selected primary component tag, and then updates the related components. The Tag format is set up on the Drawing Properties 
Components dialog box.
The introduction of one-line components has added an additional type of primary component. Within a project you can represent a component with both a schematic parent symbol and a one-line parent symbol. These are considered peer components. The retag function uses the following rules when retagging these peer components:
- If you retag a schematic parent, the tag value of the one-line parent is updated to match.
- If you retag a one-line parent, the tag value of the schematic parent is updated to match.
- If you run a project-wide retag, the first one encountered gets retagged and the peer is updated to match.
- If you run a project-wide retag and either the schematic parent tag or the one-line parent tag is fixed, the components are not retagged.