AD-Newbie

That was a HUGE help. Thank you.... Once I have them all entered I'm going to create a custom preset for these.....can't thank you enough for the help.

I am new to Affinity Designer and really like using it, but I am having some difficulty trying to find out a step by step process to export multiple custom sized png files. So for instance, I have a single design I want to export, and say I want the multiple sizes to be 16x16, 57x57, 92x92, 114x114, or any custom width, height. I have gone to the Export Persona and tried to use slices but they are fixed it seems. Like 1x, 2x etc....I don't see a way to enter custom sizes. I also was looking to see if there was a way for me to create a custom preset of sizes as well....but not sure how to do that. As i mentioned this is new to me and am trying to learn this but if someone can help me understand how I can accomplish these tasks it would be helpful. Perhaps this would be a good video tutorial to elaborate on this as well?