Thank you for contacting us and I'd be happy to assist.
To import the terms in your taxonomy(s), there are a number of third-party import plugins which can accept the data in CSV or XML format. For example, you can check out the ImportWP plugin ( https://wordpress.org/plugins/jc-importer/ ).
I've tested its free version on my website and it supports this type of import and with a really easy-to-use interface.
Yes definitely still need help.
I was having other issues with Toolset plugins which Shane sorted out for me.
The ImportWP plugin you suggested, is not working - I'm in contact with the plugin author, but so far no progress.
Are there any Code snippets for updating taxonomy terms or other plugins you can suggest? II would really help if I could update individual taxonomies without reloading all the posts each time I need to change an individual taxonomy.
Any help much appreciated
I've performed some search online, but I'm afraid I couldn't find any code snippet or third-party plugin for this.
Since you have a large number of terms and a very specific requirement, I'll recommend consulting one of our recommended contractors, to see if they can custom develop some code snippet or interface: https://toolset.com/contractors/