insert the combination values

Dear friends,

how to write the combination values like
the pairs like
first from dropdown
A,B
SECOND DROP DOWN
R

THIRD DROP DOWN
X,Y

AND DATE DD-MM-YYYY

HOW TO GET
A.R.X.DD-MM-YYYY
A.R.Y.DD-MM-YYYY
B.R.X,DD-MM-YYYY
B.R.Y.DD-MM-YYYY

IF COMBIANTIONS ALREADY EXIST EX(A.R.X.DD-MM-YYYY)ONLY DATE SHOULD
BE UPDATED HOW TO DO PLEASE RESPONSE ......I AM
UNDER PRESSURE....

AND HOW TO EXPORT THE TABLE ON CLICKING
BUTTON WHICH SHOULD BE OPEN IN EXCEL SHEET

That makes very little sense I'm afraid.
All caps doesn't help either.

Fancy trying to explain your problem again?

You can use SQL inner queries for it.
But I don't sure that I understand you correct. You need create the applications. which pull data from database and converts it in excel format.