Insert records from one table to another which do not exist in SQL Server

I have 2 table table A and table B, table A contain Documents list  and table B contain list of uploaded files against the document list id present in A table. I want to insert a blank entry against the employee if any new document is added in the list in A table.

i am trying to do like this. i am getting the id that does not exists in table B but how can I insert Blank entry for that field and for the same emp

insert into B (Status,IDtblA,empid)
select ID,Status from A
where A.ID not in
(select IDtblB from B where B.ID=B.IDtblA )