Just go to Data Source where you joined the tables. At the upper right side of that window you will get Filter option. Click on Add below that filter and select the required fields you want.
Hope this will help you.
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write a custom SQL query for joining the four tables and bring only necessary fields for each table.
please check the below links.
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You may click here after you have built the sheets/dashboards. "Hide All Unused fields" - Once done. Do an extract this would bring in only 4-5 fields as you have mentioned.
You may also aggregate the extracts if the data is at a granular level to improve the performance.
you can select the quarter or month and if you are visualizing the data at month level in the tableau and if the data is at day level in your database.