Optimization: Filter Third Gallery based on AllItems in Second Gallery

[w1sd0m]

Hello friends,

I have 3 galleries on one screen. 

Gallery A = Domain (dataverse table) 1-* 

Gallery B = Category (dataverse table) 1-*

Gallery C = Subcategory (dataverse table) *-1

If I select an item in Gallery A it filters all items in Gallery B; It also will filter Gallery C based on AllItems in Gallery B with this code:

Filter(
    Ungroup(
        ForAll(
            galCategory.AllItems.Category As P,
            Filter(
                Subcategories,
                ThisRecord.Category.Category = P.Category
            )
        ),
        "Value"
    ),
    !IsBlank(cr50e_Category)
)

Can this be done without the 5 functions? Is there a more efficient way to accomplish this filtering? It is kind of slow with only two items in there and filtering down to one.

Thanks!

[imranfc]

Hello sir, 
  how to upload  and import Leaver Request app develop by Reza.
 my issue when i am trying to upload this app zip file the file upload normally but not appear in my app list 
 how to solve this issue kindly help about this topic ?