Trade different watchlist for different buy signals

Hello Fellow Amibroker coders,
I was wondering, is there a way where by we can trade different watchlist based on different buy signals

IIF(MONTH() == 1, find stocks from watchlist 1, find stocks from watchlist 2); 

This is just an example what I want to achieve

For SMS style question, SMS style answer:

Buy1 = ... 
Buy2 = ....

Buy = IIF( Month() == 1, Buy1, Buy2 );

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