Choose from which SQLCreator to pass the data using parameters

Instead of using SQLCreator transformers, I would use the FeatureReader to collect the data.

That allows you to pre-process the Shape file and based on the area, use a different FeatureReader.

The FeatureReader can connect to the database and process a SQL statement (if necessary) or read a table.

Hope this helps.

If you want to use sql to select your areas of interest, i'd swap the sqlcreators for sqlexecutors. You can then use a creator to retrieve the parameters and route your trigger feature to the correct sqlexecutor(s)

Thank you for your response @egomm and @erik_jan.

For now, I had tried a new approach. I compare 2 automatically created excelsheets, and put it in SQLExecuter and provide a user parameter to the command.  

select * from lam_mea_oce_sea.mnr_admin_area where country_code_char3 in (@Value(country))

That's how it narrows the filtration. Something of this sort.