Try this if you are trying to execute a .sql file in SSMS:
:r C:\Scripts\Script1.sql
:r C:\Scripts\Script2.sql
:r C:\Scripts\Script3.sql
...
note: for this to run turn on sql command mode (Query > SQLCMD Mode)
If these are scripts you run fairly often you might consider dropping them in a stored proc and running them that way…
You can also do it through sqlcmd (which I believe is more common):
sqlcmd -S serverName\instanceName -i C:\Scripts\Script1.sql