You can disable a product in your web store, but the specific steps will depend on the Sage ERP you are using.
In Sage X3, you can make a product Inactive on your web store by changing the respective Product status in X3.
With Sage 300, you should uncheck the “Allow in Web Store” box on the item.
After deactivating a product in the web store, be sure to reindex Elasticsearch. Otherwise, the product may persist in product search results.