Adding two tables via expression builder

Hello,

I am using expression builder because I have VBA coding which calls a query. Since my VBA is already complecated, I am trying to do certain things in expression builder.

I have (maximum) of 3 additions to be done. These are based on 2 tables.

I have to get 1 set of values from one table and 2 sets of values from another tables.
The 1st set I mentioned above is based on a 'combination' of City & Province  [eg: TorontoOntario] which has associated values
The 2nd set I mentioned above has  2 sets of criteria but both sets are located in 1 table. One for City (which has associated values) another for Province (which has associated values)

Now all these 'associated values' are same (in terms of naming) They are

MIN, MAX, 1M, 2M, 3M...and these are numbers

I want to output the combined sum of MIN on one column by

Geting the relative 'MIN value' from Combo table..lets call this table1
Getting the relative 'MIN value' from City column from  table2
Getting the relative 'MIN value' from  province column from table 2

Bah I just confused myself :( Anyway back to the matter

So I want to filter out table one using 'TorontoOntario' and take the MIN value, filter out table2 using 'Toronto' and get that 'MIN' value and filter out table2 for 'Ontario' and get that MIN value as well and add it

Then repeat this for other values such as 'MAX, 1M, 2M'

I really need advice on this as I am really confused on how to do it. What is the best way to do it?

Any directions is much appreciated!

Sort of something like this (https://www.experts-exchange.com/questions/21525168/Problem-adding-the-contents-of-two-2-tables-and-creating-a-third-table-with-the-resulting-totals.html?sfQueryTermInfo=1+10+30+ad+express+tabl+two)

 but with 3 tables based on 3 diff criterias BUT being done in expression builder. If someone has better advice, please do. I am capable of self learning but any start up is much appreicated!

Regards,
Shanan