# Binding the ViDi Tool Editor to a ViDi Tool

After adding the ViDi Tool Editor, you need to bind the Subject property of the element to one or more ViDi tools.

1. Click the double-arrow icon of the Subject property, and in the Expression Builder, and then type:

   For a single tool: ListOf($Tasks.TaskName.ViDiSubTaskBlockName.ViDiToolName.Instance)

   For more than one tool: ListOf($Tasks.TaskName.ViDiSubTaskBlockName.ViDiToolName.Instance,$Tasks.TaskName.ViDiSubTaskBlockName.ViDiToolName.Instance,etc.)

2. Click OK to set the binding.

3. The Subject property will now be bound to the ViDi tool instance tag/tags.