PIDs such as Wikidata IDs, ISNIs, Getty URIs, DOIs, Gazetteer URIs and IDs from other collections can be added to collection management systems. These can be included for related collection items, an identifier for a collection item itself where it is represented in another identifier scheme and authority files.
Your existing system must have the capability to be able to host these identifiers. Be aware that sometimes these capabilities can be hidden based on a custom configuration of the system but could be exposed for use.
Their utility for cross-linking is improved when they can be expressed as URLs so it helps if your system can manage that.
Baseline collection management system required.
For more compatible identifiers, see Which persistent identifier does what?
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The Library of Congress provides links to other identifiers in its names identifier file.
National Galleries Scotland and Moma in New York integrate Getty ULAN records and Wikipedia data into their artist web pages.
Consult the different aspects, from here you may want to look at Identifiers as links with no commitment to persistence.