Data Transfer Between Databases Different Structur

Ok say we've got two databases with two tables and we need to
transfer data from one to another. However, the data structure in
sourceDB is different to targetDB. Better to illustrate:
sourceDB
tablesource
PIN SYSTEM HEADER PROPERTY VALUE STATUS
1000 AF ADDRESS DETAILS LINE 1 The Grange Active
1000 AF ADDRESS DETAILS LINE 2 69 Tintagel Way
1000 AF ADDRESS DETAILS LINE 3 Woking
1001 AF ADDRESS DETAILS LINE 1 50 Active
8888 AF ADDRESS DETAILS LINE 2 Evans Way
8888 AF ADDRESS DETAILS LINE 3 Islington
8888 AF ADDRESS DETAILS
8888 AF ADDRESS DETAILS
8888 AF ADDRESS DETAILS

Now each matching PIN on the multiple rows in sourceDB above relates to
one customer. In order to extract the relevant info for an address for
instance for each customer, we need to know the unique PIN, header,
property and value fields.

So I created this piece of SQL which gives me the result in targetDB:

INSERT into targetDB.dbo.tabletarget (address1)
SELECT
value
FROM sourceDB.dbo.tablesource
WHERE pin = 1000
AND header ='address details'
AND property = 'line 1'

targetDB
tabletarget
PIN ADDRESS1 ADDRESS2 ADDRESS3 SOURCE
The Grange

Fine, I've proved I can extract a specific field, but I need to do
this for all fields and all customers.

Any ideas?