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1. Software offers an option to change parameters of some elements (e.g. items, companies) together.
Open catalog and select elements to change . Right (Use CTRL plus right click on mouse to select many elements together).
Once selected, right click opens the menu. Choose Change selected option. 
Or use Change Selected option at the List Toolbar:
2. In Group Change of Object window, choose parameter to change, put a tick and set required value:
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3. Press Next and observe current values, un-tick unmark elements if required. Apply Change.
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Find the corresponding field in the element to be sure that changes are correct:
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# modify group change object processing attribute