It's possible to just click one action button and execute multiple actions through combine buttons, for example, clicking Create Delivery Note + SO Complete to execute Create Delivery Note (Convert records) and SO Complete (Update values) simultaneously.
Navigate to Design Mode on your form page and click Form Tools > Combine Buttons under the Custom Buttons title.
Note: You can see combine buttons only if your sheet already contains existing action buttons, and only the action buttons created from Custom Buttons under Form Tools can be combined.
A pop-up window will allow you to select the buttons that you would like to combine.
Please note that if you make any changes on the source buttons, it will not apply to a combine button that has already been set.
Therefore, if you delete or modify the source buttons, you will need to Combine Buttons again.
Additional settings you can configure for action buttons are further explained in this article.
If you want to remove an action button, you may refer to this article.