diff --git a/src/jsonlogic/registry.py b/src/jsonlogic/registry.py
index c0dbb03..f1a7a64 100644
--- a/src/jsonlogic/registry.py
+++ b/src/jsonlogic/registry.py
@@ -117,27 +117,22 @@ def remove(self, operator_id: str, /) -> None:
 
         self._registry.pop(operator_id, None)
 
-    def copy(self) -> Self:
-        """Create a new instance of the registry."""
-
-        new = self.__class__()
-        new._registry = self._registry.copy()
-        return new
-
-    def with_operator(self, operator_id: str, operator_type: OperatorType, *, force: bool = False) -> Self:
-        """Create a new instance of the registry with the provided operator.
+    def copy(self, *, extend: OperatorRegistry | dict[str, OperatorType] | None = None, force: bool = False) -> Self:
+        """Create a new instance of the registry.
 
         Args:
-            operator_id: The ID to be used to register the operator.
-            operator_type: The class object of the operator.
-            force: Whether to override any existing operator under the provided ID.
-
-        Raises:
-            AlreadyRegistered: If :paramref:`force` wasn't set and the ID already exists.
+            - extend: A registry or a mapping to use to register new operators
+                while doing the copy.
+            - force: Whether to override any existing operator under the provided ID.
 
         Returns:
             A new instance of the registry.
         """
-        new = self.copy()
-        new.register(operator_id, operator_type, force=force)
+
+        new = self.__class__()
+        new._registry = self._registry.copy()
+        overrides = extend._registry if isinstance(extend, OperatorRegistry) else extend
+        if overrides is not None:
+            for id, operator in overrides.items():
+                new.register(operator_id=id, operator_type=operator, force=force)
         return new
diff --git a/tests/test_registry.py b/tests/test_registry.py
index 3eb45cc..b22dc3a 100644
--- a/tests/test_registry.py
+++ b/tests/test_registry.py
@@ -89,12 +89,19 @@ class Var(Operator):
     assert copy._registry == registry._registry
 
 
-def test_with_operator():
+def test_copy_with_operator():
     class Var(Operator):
         pass
 
     registry = OperatorRegistry()
 
-    copy = registry.with_operator("var", Var)
+    copy_dict = registry.copy(extend={"var": Var})
 
-    assert copy._registry == {"var": Var}
+    assert copy_dict._registry == {"var": Var}
+
+    other = OperatorRegistry()
+    other.register("var", Var)
+
+    copy_registry = registry.copy(extend=other)
+
+    assert copy_registry._registry == {"var": Var}