Nick appreciate the feedback but not sure how can i create a standard process to automatically populate what you indicated.
I can create the column to make the column but to get the value, not sure how to get the "C" populated for every record without manually typing that. i want to have all records have that "C" value.
can someone give me an example how to make that new field populate with that "C"
You're almost there. It seems that you're confusing a "formula-based" calculated field with the "user-edited" approach.
To automatically fill the field value for each record, you want to use the "formula-based" calculated field.
The "user-edited" approach will, by definition, require that you key each field.
Create a formula based calculated field and as Nick says simply make the expression for the field: