You can select or deselect merge actions in the pane of the model to be merged, using:
To do so, you right-click an object or a category in the pane of the model to be merged and select the Select or Deselect command to open the sub-menu of the merge actions.
By default, all creation, modification and move actions are selected in the model to be merged, deletion actions are not selected.
For consolidated models, the merge actions selected by default depend on the latest modifications saved in the model. For generated models, if the Preserve modification generation option was selected, they depend on the modifications saved in the model to be merged.
The following selection tools from the merge toolbar: