Macro to match identical names and allocate ID's

[foncesa]

HI everyone,
The records in column D (name) have identical names which can be 4-5,

The Column B (reference) have different numbers in it.

The column A contains ID's. (Which is different)

Now i want to allocate the same ID's (Col A) to all the identical names in Column D.

Before giving ID to identical group I have to make selection from Column B (Reference)

For example identical 5 name in column D, then Column B has 5 different nos. like 1001,1002,2001,2002,2003 then 2001 ID (Column A)
is most important and this ID will be given next 4 ID's Col A.

I have a big data base to convert like this so whats the best option, a proper direction, Confused?

Please help?

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