Compiling Tags that exist in Cicode

We are using Citect SCADA 2018 R2. My question is pretty basic, is there a way to compile a project that has a variable listed in Cicode but not officially defined? I have taken over for an engineer that is no longer with us and I know his projects work because we've run them for quite some time, but every time I hit the compile button it tells me that certain tags are not defined and I believe they are tags that he added.

Thanks in advance.

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