You may read earlier post to add transactional publication in replication here http://beyondrelational.com/justlearned/posts/730/adding-the-transactional-publication-in-replication-sql-server.aspx, here how can we add a transactional pull subscriptions to a publication which executed in publisher database.
USE [PublisherDB] GO EXEC sp_addsubscription @publication = N'Publication Name', @subscriber = N'Subscriber Server', @destination_db = N'Subscription database', @subscription_type = N'Pull', @sync_type = N'automatic', @Article = N'all', @update_mode = N'read only', @subscriber_type = 0 GO