I create a column "LookUpValues" of type LookUp in Site A but I'm trying to add from existing site columns in Site B but it doesn´t show up. Is it possible to do it? Any ideas?
Yes.
It is possible to use the content type from one site to another site using Content type hub.
But to use the content type from one site to another site, you need to do some configurations. Follow the steps given in below articles to achieve this:
answered Jan 14 '19 at 3:06
If the Site A and Site B are in the same site collection, you can create a site column with lookup type in the root site of the site collection. The site columns are available to all sites in the site collection.
Learn more about how to create a cross-site lookup site column
If the Site A and Site B are in the different site collection, you need code to achieve that.
For example, you can do a cross site collection lookup and populate it as a dropdown control in your SharePoint application using jQuery.
The demo:
http://www.sharepointfix.com/2010/11/cross-site-collection-dropdown-look-up.html
answered Jan 14 '19 at 5:45
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Only works when I create in the root site of the site collection, but in the root site I don't have the list that I want. Do you have another option? – KmDroid Jan 14 '19 at 9:20
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You also need to create the list in the root site of the site collection. – JoannaW_MSFT Jan 14 '19 at 9:24
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You can save this list as the list template and then import it to the top site of the site collection. Or, you can export the list to Excel spreadsheet and then import to list – JoannaW_MSFT Jan 14 '19 at 9:55
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