Left Fret Fingers and strings count.
 Belabouring the obvious, and it's the fingers that fret, the
 tenor banjo's 4 strings are numbered according to the order in 
which any fret hand finger crosses them. The Thumb can be centered
positioned on the neck , opposite the 2nd & 3rd fingers.
 The first set here at the nut, fret 1... is merely to show all 
4 fingers (u) are equally important. 
 The innumberable combinations of stops is in tandem  with the 
discretion of the right hand attack, how many strings are sounded.
 In my tabs the numbers refer to the fret.
 _/Fret\_/
[1 2 3 4]
[u u u u]
|-.-.-.-|
/ __/T\__\
\uuuu/              {A=440 Hz}
1rst string________A|u u u u|A
2nd string_________D|u u u u|D
3rd string_________G|u u u u|G
4rth string________C|u u u u|C
                    __/T\__


Sandy's Grips and Wise Tablature
~C_G_D_A~ /BFlat/_A|Z1++|A |X| ~C_G_D_A~ /EFlat/_A|Z1++|A
[- - - 1]    / ___D|Z3++|D |X| [- 0 1 1]    / ___D|Z1++|D
[2 - -  ]   / / __G|Z3++|G |X| [- -    ]   / / __G|Z0++|G
[  3 4  ]  / / / _C|Z2++|C |X| [3      ]  / / / _C|Z3++|C
g\ \ \ \__/ / / /s/,,TAB,, |X| g\ \ \ \__/ / / /s/,,TAB,,
;r\ \ \____/ / /b/;;;;;;;; |X| ;r\ \ \____/ / /b/;;;;;;;;
::i\ \______/ /a/::::::::: |X| ::i\ \______/ /a/:::::::::
GRIP\________/T/!!!!!!!!!! |X| GRIP\________/T/!!!!!!!!!!


Example:
 Here is Bb  Major |X| Eb Major is here.
Adding the two Tabs from the diagrams, above, gives the 
sequence:
A|Z1++++++Z1++++++|A
D|Z3++++++Z1++++++|D
G|Z3++++++Z0++++++|G
C|Z2++++++Z3++++++|C
~`,---,---,---,---`~