New link rules are added by selecting the Add…<\/strong> button to the right of the Project Setup window.<\/p>\n Selecting Add…<\/strong> opens the Link Rule Setup<\/em> dialog. The purpose of this window is to select the attributes for our new link rule.<\/p>\n When creating link rules, you need to decide their purpose and to what items\/aspects you want them to apply.<\/p>\n This defines what the rule will allow in terms of Creation, Deletion <\/em>or Modification.<\/em><\/p>\n When creating link rules, remember they are applied in a top down fashion, the first match wins. If there is a narrow case you don’t want to allow, you may choose to PREVENT<\/em> this first and then add an ALLOW<\/em> below it. If there is a narrow case you want to ALLOW<\/em> you would order this first and then PREVENT<\/em> everything else.<\/p>\n To allow Requirements<\/em> to be linked to any Equipment Design<\/em> item, with any link except CHILD<\/em> you would define two rules.<\/p>\n To allow the Requirements to be linked to other Requirements using the CHILD link, and nothing else a further two rules would be added.<\/p>\n![\"Select](\"https:\/\/www.threesl.com\/blog\/wp-content\/uploads\/2017\/06\/link_rules_add.jpg\")
![\"Creating](\"https:\/\/www.threesl.com\/blog\/wp-content\/uploads\/2017\/06\/link_rule_setup.jpg\")
Specifying Options and Attributes in Link Rule Setup<\/h2>\n
Rule Control<\/h3>\n
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Cross Reference Attributes<\/h3>\n
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Matched Rule Controls<\/h3>\n
Ordering Rules<\/h2>\n
Example:<\/h5>\n
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![\"How](\"https:\/\/www.threesl.com\/blog\/wp-content\/uploads\/2018\/04\/Link_Rule_Order.png\")