Passing an object repository object (input field) as argument to a sequence

To make my code more modular I am looking for a way to make a sequence with arguments:
parObject (when calling the sequence pass an input field from the Object Repository)
Value (the new value for the input field)

The sequence itself checks the current value of the input field, updates the value in case the field is empty, otherwise throw error.

My question: is this possible? How do I put an object from Object repository into the argument?