If you want to change the custom field of ‘Text’ type to ‘Picklist’, the new picklist field will automatically pickup current distinct values from the text field (upto a maximum of 250).
When subscribing to Salesforce.com, Environment licenses (i.e. Editions) can change, but they can only go up in edition, not down. So for example in the case of Sales Cloud you can start with Group Edition, upgrade to Professional Edition, upgrade to Enterprise Edition and finally upgrade to Performance Edition. More
Patent filed. Please contact me for the use of this technology. 🙂