To do so go to Resources->People and click on 'Set work cost' icon. There you can set the cost for every task category, set the cost per hour or cost per surface which then can be applied to all your workers at once. You can also set up this cost separately for each worker.
By clicking on edit icon at each user and worker, and then on ‘’Work cost’’, you can set a cost per hour and per surface for that particular user/worker. Once you define a cost per hour or cost per surface, this cost will automatically be visible in crop production tasks and included in the finance calculation.
To see video how to manage work cost per categories of activities click HERE.