I have some data found here: https://1drv.ms/x/s!AktAOe8JUNECiKkS30iC2jH4jX5GdQ?e=eYGYBa
Column A is the PARENT with 00000000 the TOP value.
Looking at the data in column B, we see 00000000 has many 2nd level values. Looking at the first 2nd level, 00000004, we then look that up in COLUMN A...