stId: list.Id, LookupFieldName: &quot;Title&quot; });
// create a new dependent lookup field called 'My Dep Field' showing 'Description' based on an existing 'My Field' lookup field in web.
const fieldDep = await sp.web.fields.addDependentLookupField(&quot;My Dep Field&quot;, field.data.Id as string, &quot;Description&quot;);
// create a new dependent lookup field called 'My Dep Field' showing 'Description' based on an existing 'My Field' lookup field in list 'My List'
const field2 = await sp.web.lists.getB