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How to use predefined signature itself as Conditions while creating custom NSP IPS Rules?

A particular Signature in an NSP rule is not relevant to the environment and it is causing thousands of false positive alerts. Apparently there is no way to disable/add exception for a specific signature in a rule,  so I am trying to make a clone of the rule and thereby remove the unwanted signature. In the original rule, signatures are like below .

Signature #1

condition 1
[Any Of]
http-req-query-params matches "xyz" ( case-insensitive )
[OR] http-req-query-params matches "abcd" ( case-insensitive )

Signature #2

condition 1
http-req-query-params matches "abcd" ( case-insensitive )

All these I'm able to create using the options available on the Custom Attack editor options. Now there is Signature 3 which shows like - 

condition 1
[Any Of]
After Signature # 1
[OR] After Signature # 2
[AND] http-rsp-code &gt 123 ( unsigned )

Now the question is, how do I add these "After Signature # 1, After Signature # 2"  conditions  from the Custom Attack editor? Which option should I be choosing ? 


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