How to give both dependency b/w category and subcategory and Select type of application and subcat

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Hi,

We have subcategory field that field is dependent on Category it is working fine for dependency b/w category and subcategory.

Here I need to give subcategory field that field is dependent on Select type of application field for dependency b/w Select type of application field and subcategory.
It should work for both dependency b/w category and subcategory and also Select type of application field and subcategory.

Can anyone please help on this, It will be usefull..

Thanks!