In the Project Editor, select Tags | Trend Tags. The Trend Tags dialog box will display:
For each trend, in the Cluster Name field, select the cluster that will run the trend. If there is only one cluster defined in the project, you can leave this field blank. The trends will default to the defined cluster.
If the project has multiple clusters, and you do not select a cluster in this dialog, CitectSCADA considers the trend to run on defined clusters.
Click Replace to save the changes.