Fill the holes with wood filler, then let them dry completely, and sand them until smooth.

How to Transform 2 Old Chairs Into 1 DIY Bench

How to Transform 2 Old Chairs Into 1 DIY Bench

Image credit: AnOregonCottage via YouTube

Easy Way to Transform 2 Old Chairs Into 1 DIY Bench

2 Old Chairs Repurposed Into 1 DIY Bench