If you are looking for a tool to easily manage prices displayed on pages of products, categories and tags, the WooCommerce Hide Price, Hide Add to Cart Plugin plugin is exactly what you need.
plugin “Hide Price & Hide Add to Cart” by Motif Creativeshides the price and the Add to Cart button for specific products or entire categories. It manipulates prices displayed from customer groups, store views, and countries. If the price of an item is automatically hidden, the same thing happens with the Add to Cart button. You can personalize the button text and display messages to make your pricing policy flexible and adaptable.