Suppress Specific IP Warnings in Modelsim
I don't think you can suppress one warning without suppressing all warning of that number. 

You can edit your local modelsim.ini file

look for

[msg_system]
; Change a message severity or suppress a message.
; The format is: &lt;msg directive&gt; = &lt;msg number&gt;[,&lt;msg number&gt;...]
; Examples:
;   note = 3009
;   warning = 3033
;   error = 3010,3016
;   fatal = 3016,3033
;   suppress = 3009,3016,3043
; The command verror &lt;msg number&gt; can be used to get the complete
; description of a message.
suppress = 2083,2070