Truly dynamic list generated by selection of static list?

[obidon]

Hi, I've been long time member but never needed to post because I could always find my solution with searches. I've performed searches for my current issue but my problem is slightly different than the results I am receiving.

I am looking to create a dynamic list (combo box) based on a single entry in one column and the corresponding items in an adjacent column.

Example attached; On the Receipts sheet, I would like to check A (Type) to find the value of F16 and create a list (combo) of all unique B (Sub Type) items in G16 related to F16. It seems as simple as a Lookup, but you can't put a lookup in Data Validation (at least I can't get it to work).

This is all so I can perform a calculation in H16 based on the selection in G16; I should be good with the calculation, I just don't know how to make the Data Validation List be dynamic based on the values that exist in B and relation to A. I also may be making the whole idea more difficult than needs be. :p

I've currently set my list limit to 254 (i.e. A2:A255).

example.xlsx

Example: by selecting Gas in F16, G16 will populate with all Sub Types related to Gas (i.e. Petro Canada, Pioneer) which would in turn produce the total of all Amounts (D) in H16 based on the G16 selection. Gas > Pioneer > 189.92

Any help or ideas is greatly appreciated.