Reliability and validity analysis

Dear All,

I have a small doubt in performing reliability and validity analysis according to my constructs and dimensions in the operationalization table. 'C1' is one of my constructs with two dimensions 'D1' and 'D2'. Do I need to perform reliability analysis and dimension reduction on the whole construct (C1) or on the two dimensions (D1 and D2) separately? What is the correct way? The below is the abstract view of my operationalization table.


I am very much thankful if anyone can clarify my doubt.

Thank you.