Using data a field to update another using Bulk Update

How can I update data from a field using the data from another using Bulk Update?

Please clarify your question more.

outro_inidicacao is a field… I want to get its value but when I run the Bulk Update it update source_detail field with the string “outro_indicacao” instead the value.

You should put the value to be updated not field name, this is not possible with this tool.