Annotating from known variants
Filter against known variants describes how to filter against known variants, but the CLC Genomics Workbench also includes a tool to annotate known variants:
Toolbox | Resequencing () | Annotate and Filter | Annotate from Known Variants
This tool will create a new track with all the experimental variants including added information about overlapping variants found in track of known variants. The annotations are marked as either overlapping or matched as explained in detail for the filtering version of the tool.