Calculation and prefilter accross 3 lists. Help needed

shaq

New Member
As an advanced user of CMS Joomla, I discovered a few months ago fabrik for the development of web application. Novice I try since to develop an online application of management of employees. I created an employer table, an employee table, and a tax table (contribution payable). I made a joined database between the employer list and the employee list. But I block on certain prefilters and on the method of calculating the taxable contribution on the salary of the employees. I have a gross salary element that is a field and a taxable amount element that must be the result of the contribution element to pay (tax list) which is a drop down multiplied by the gross salary item (list employees).
If someone would like to give me a helping hand especially to calculate the taxable contribution to each employee (gross salary x tax). I would also like to have a little help for prefilters including prefilters date (last declared employee, employees declared during the month, etc ...)

Am on Joomla 3.6 et fabrik 3.5.1
 
We are in need of some funding.
More details.

Thank you.

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