please see FamilySearch ⟶ Add Person
From ⟶ GEDCOM ⟶ Individuals view the persons, along with their FamilySearch links
Search for the Id's (Use the Or operator to join the Id's together), see User Interface ⟶ Searching
From ⟶ World ⟶ FamilySearch ⟶ FamilySearch Tables ⟶ Parent-Child
Click
Search for the Id's (Use the Or operator to join the Id's together), see User Interface ⟶ Searching
Click and enter reason for change
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The FamilySearch Parent-Child Relationship is created.
Click to view the relationship on the FamilySearch portal.