Text To Attribute App
AutoCAD® Command WCST2ATT
The Text To Attribute App converts a selected Text or MText object to an Attribute Definition object. This is a great tool if you have an existing drawing that you would like to turn in an AutoCAD® Block. Converted Attribute Definitions retain the selected Text or MText object's properties and the selected object's value is, by default, used as the Attribute Definition's Default value; however, this can be changed as required before clicking the OK button.

Online Help
WCST2ATT (Command)

Attribute settings (Section to specify the settings for the attribute)
Mode: Specifies the mode of the attribute, options include Invisible, Constant, Verify, Preset, Lock position and Multiple line (set by selected object; Text or MText)
Tag: Specifies the attribute tag.
Prompt: Specifies the prompt for the attribute.
Default: Specifies the default value for the attribute.