Selective copy operation

Access 2013 - Desktop database
I'm attempting to copy selected records from one table (A) to another (B) dependent on yet another table (C)
Each table has the field "idnumber" which is a long integer.  IN fact all fields in all tables are the same.
C has the controlling list of idnumbers
I want to copy records from A into B if a.idnumber is in the c table.
I've used
INSERT INTO B select * from A where A.idnumber in (select idnumber from c);
but it copies every record in A .  I tried a couple of other techniques but no joy.
(Yes, I need a separate copy of the records in a table since I'm using table B in other databases via linked.
ideas?  does anyone have the specific statement which might work?
Keyboard CowboyAsked:
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Rey Obrero (Capricorn1)Commented:
<but it copies every record in A >

maybe, all idnumbers from A are in C

to check run this query

select * from A
Inner join C on A.idnumber=c.idnumber

check the number of records return

open table A and see how many records you have.

if they are the same, then all records in A are in C based on the idnumber field.
Rey Obrero (Capricorn1)Commented:
also, try

INSERT INTO B select * from A Inner join C on A.idnumber=c.idnumber

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Keyboard CowboyAuthor Commented:
Checking - thanks
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