TREATAS

Hi Maximous89 ,

You can use use treatas to achieve your required output.

Since LEVEL_5_DESC (from H1) contains the values you want to map to LEVEL_3_DESC (in H3), treatas is the function which can move that lineage.

Here is the refined measure. 

Tested Solution = 
VAR _SelectedLevel5 = VALUES(HIER[LEVEL_5_DESC])

RETURN
CALCULATE(
    [Avg of HANDNP],
    REMOVEFILTERS(HIER),             -- Remove existing context from the visual
    HIER[AC_HIERARCHY_CODE] = "H3",  -- Force the calculation to look at H3
    HIER[HLEVEL] = "MANUFACTURER",   -- Ensure we are looking at the right level type
    TREATAS(
        _SelectedLevel5,             -- Take the selection from the visual (e.g., "Toyota" from Level 5)
        HIER[LEVEL_3_DESC]           -- Apply it as a filter to Level 3
    )
)

The resultant output is as shown below:

I have attached an example pbix file. 

Best regards,