1.     Locate the new Config on the “Configurations” tree

a.     Should be at the bottom

b.     Likely called “Config A”

2.     Double-click on the config label “Config A”

a.     In the Modify Config dialog:

i.        Change the config label to “Legoman”.

ii.      Enter the text “txt” into the Extensions field.

iii.    Check “Insert Header” in the Preprocess section.

iv.    Click Ok.

3.     From this step onward, all nodes referred to will be located within the "Legoman" config.