Problem: How to edit several catalog elements at once?
Solution: Use Change selected option in catalog.
1. Software offers an option to change parameters of some elements (e.g. items, companies) together.
Open catalog and select elements to change (Use CTRL plus right click on mouse to select many elements together).
Once selected, right click opens menu. Choose Change selected option. 
Or you can see this option at the top of the Master data.
2. In Group Change of Object window, choose parameter to change, put a tick and set required value:
3. Press Next and observe current values, un-tick elements if required. Apply Change.
4. As processing is completed, a message pop-up. New values are successfully applied. Close the window.
Find the corresponding field in the element to be sure that changes are correct:
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# modify group change object processing attribute