Hi I'm using a multiple text string where I add items to the list following this tut https://docs.umbraco.com/umbraco-cms/fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/multiple-textbox I now would like the items in this list to be available in another Umbraco property so when I build a page the user is forced to select an item from this list in the BACK OFFICE (not front) This list would be maintained by someone else so certain creators would only select the available options created in this list. Is this possible? Thank you

Sounds like you're going to need to build a custom property editor. Unless you can just get by with a content picker that picks from a global set of nodes. This is usually the way I handle this kind of thing.

https://github.com/leekelleher/umbraco-contentment/blob/develop/docs/editors/data-list.md Could be extended? rahter than build you own propeditor?