Create SQL objects with the file name of NNNN_SCHEMA_OBJECTNAME.sql - this script allows you to bulk change the schema name on the files

RenameFiles_ChangeSchema

$dir = 'C:\svn\SQL'

$files = Get-ChildItem $dir -Filter *.sql

Foreach ($file in $files) {
    $old = $file.FullName
    $new = $old.Replace("_OldSchema_", "_NewSchema_")
    Rename-Item -path $old -NewName $new
}