Matrix - Create a measure with data from matrix and another table

[skhong]

Hi Everyone, I would like to create a measure to calculate the inventory holding of individual model number which involves data from two tables (DailyItemSales and DailyStockBalance), date column in both tables have different names. The unique identifier of both tables is UPC.  Below is what I would like to achieve:
1) A slicer to select a single date for stock balance in a matrix, date data = snapshotdate. 
2) A separate slicer to select a date range for DailyItemSales to get past 7 days sales, date data = reportDate. 
3) to calculate inventory holding = inventory in Hou / Past 7 days.
How do I create a measure to select only columns with warehouse with named "Hou" in a matrix (as below) to divide by past 7 days sales from another table with different date selection? Any answer is appreciated. Thank you. 

Table

Matrix

[Greg_Deckler]

@skhong Sorry, having trouble following, can you post sample data as text and expected output?
Not really enough information to go on, please first check if your issue is a common issue listed here: https://community.powerbi.com/t5/Community-Blog/Before-You-Post-Read-This/ba-p/1116882

Also, please see this post regarding How to Get Your Question Answered Quickly: https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490

The most important parts are:
1. Sample data as text, use the table tool in the editing bar
2. Expected output from sample data
3. Explanation in words of how to get from 1. to 2.

[skhong]

Thanks @Greg_Deckler for your reply. I would like to add new measure(s) to calculate the inventory holding in stock balance matrix table. The formula for the measure will be current stock balance (various warehouse) / Past 7 days sales average. Sample of the end results that I want as below.