There are 7, not just 3

Main Ones

Type 1 – Overwrite

Type 2 – Add a row

Type 3 – Add a column

Variations

Type 0: Retain Original

Type 4: Add Mini-Dimension

Type 5: Add Mini-Dimension and Type 1 Outrigger

Type 6: Add Type 1 Attributes to Type 2 Dimension

Reference