Add some item

Hello,
i want to ask if someone know how to add some value of item in only one, to compare in a rule.
I have many item from local weather and i want add all this item in only one.
what i can do it?!
Thanks a lot

I don’t know, if I understand correctly: You want an existing item to have a specific value and don’t know how to update the item?

  1. do it in OH3-UI → depending on the item you can “add metadata” - chose “default Standalone widget” and activate a corresponding widget for your item type to edit the value of the item
  2. if it’s really only once - use the REST API, there’s a bunch of examples in the docs: