To Set Up Suppression Rules

In the Clash Detection dialog job list, select the job for which you want to set up suppression rules.
Select the Rules tab.
In the Suppression Rules section Check rules to activate list box, turn on all suppression rules you want to activate for the clash detection job.
As you turn on a rule, it displays in the Rule description section and can be edited by clicking the underlined value.
From the Job menu, select Advanced Settings and in the Advanced Settings dialog, set the tolerance and clearance settings.
(Optional) To create additional suppression rules, click New to open the Rules Template dialog, which allows you to create a new suppression rule from a template.
Select Up or Down to change the order in which the suppression rules are applied.