You can do it in two simple steps:
Step1: on DB2, right-click on table1, then select "Script table as-->CREATE TO-->New Query Window Editor" this will script your table structure; then just run the generated script USING DB1 ( USE DB1 on top of the generated script).
Step2: Run this if your 2 databases are located on the same SQL server instance
INSERT INTO DB1.table1
SELECT * FROM DB2;table1
if not, then if you have a linked server just run it like this:
INSERT INTO DB1.table1
SELECT * FROM YourLinkedServerName.DB2;table1
And you're done !