When we expect to duplicate schema changes, we always code them in SQL.
if not exists(select * from sysobjects inner join syscolumns on syscolumns.id = sysobjects.id where sysobjects.name = 'LEADS_CSTM' and syscolumns.name = 'TIME_FRAME_C')
begin -- then
print 'Adding LEADS_CSTM.TIME_FRAME_C'
exec dbo.spFIELDS_META_DATA_Insert null, null, 'TIME_FRAME', 'Time frame for move in', 'TIME_FRAME', 'Leads', 'varchar', 25, 0, 0, null, null, 0;
end -- if;