The phrase "approve existing" is correct and usable in written English.
It can be used in contexts where you are referring to the act of giving approval to something that is already in place or established.
Example: "Before we move forward with the project, we need to approve existing protocols to ensure compliance."
Alternatives: "authorize current" or "validate existing".
While American stem cell researchers were celebrating the final NIH stem cell guidelines, questions remain, particularly whether the National Institutes of Health will approve existing lines in time for use with stimulus funds.
For example, both Eggan and George Daley of Children's Hospital Boston wonder who will be on the NIH working group and how quickly it will review, and hopefully approve, existing human ES lines.
Even if the new rules are approved, existing bilateral agreements between individual European governments and the United States might keep data flowing across the Atlantic as part of efforts to fight terror and crime.
Currently, ISR remains an intractable problem with no approved and/or optimal treatments available, while OAS+BA may offer more straightforward revascularization options using currently approved existing technologies.
Persuading shareholders to approve the existing buyout offer in its current form is a difficult task.
The ones without gym-toned bodies might even approve of existing regulations that forbid immodest dress in its pretty central square, La Piazzetta.
It would also help address the proliferation of new coal-fired plants, which local governments continue to approve despite existing coal-fired plant overcapacity a continuing drop in electricity demand.
The commission also points out that the bulk of its time is taken up with whether to approve alterations to existing landmarks.
Under a 1998 law passed by Tony Blair's government, no new selective state schools can be opened, although the DfE may approve expansions of existing schools.
Voting mechanisms, enabling users to approve or refuse existing tags, provide an extra guarantee on the quality of the annotations.
Usually the franchise company has the right to approve buyers of existing restaurants, or to buy back the location.
