Is there MDX outline syntax to perform specific logic on only certain months within a given year?

Summary:

I have several outline formulas where i want to have a different outline formula for different months in the year in my accounts dimension. Is there a way to do this? I don't want to have to make any reclass entries if i don't need to do so.

Content (please ensure you mask any confidential information):

For example, I have logic that is valid for January to August of this month (see code snippet below). For September and on it will be different than this.

Version (include the version you are using, if applicable):

25.09.77

Code Snippet (add any code snippets that support your topic, if applicable):