Hi @HCAZ welcome to the forum! You can use this tool to identify a style (or the style closest to it), then edit it according to your needs. The CSL file can then be exported, imported into Paperpile and used as a custom style. Happy to help if you have trouble getting it to work.
Thanks @giovanni! Really appreciate you taking the time out to respond to me. The tool you mention is very useful, thank you for sharing that. I will definitely bookmark it! I tried it on the above but I’m not getting an exact match, the closest is a 13% match. The date for instance isn’t in the same position. I’m wondering if what I have is a custom ‘housestyle’ maybe - is there any way I can edit a CSL file, that might just do the trick? Thanks again!
Yes, this website also allows you to edit and save a custom style. I tried to create a numbered APA, attached, you can import that in Paperpile following this guide or the steps below.