Hi Connie,

Here is information on how to manage carpenter bees from the an ISU ext article. I have also linked the article for additional info about them. 

"Bare, unpainted or weathered softwoods are preferred, especially redwood, cedar, cypress and pine. Painted or pressure-treated wood is much less susceptible to attack and a coat of paint or a heavy stain will protect wood from further attack. Individual carpenter bee nests can be treated with insecticide dust or with "wasp and hornet" aerosol spray. Treat at night to avoid possible stings. You may choose to hire a certified pest management professional to provide this service. Do not plug the nest entrance after treatment if the bees are active. Holes can be filled with wood putty or wooden dowels in the fall and the entire wood surface painted or varnished."

From:https://yardandgarden.extension.iastate.edu/encyclopedia/carpenter-bees