Estoy haciendo una suposición, pero creo que estás tratando de graficar tus resultados usando Graph Builder. Si es así, la única forma que conozco para obtener el resultado que necesita es agregar una segunda columna X en su tabla de datos, que muestra el segundo grupo de valores de X. Graph Builder solo proporcionará ejes separados si hay columnas separadas.

En el ejemplo, arrastre el eje Y al área de colocación Y, y luego arrastre las variables del eje 2 X de una en una al área de colocación del eje X, colocándolas una al lado de la otra. A continuación se muestra el script que produce el gráfico anterior.
Names Default To Here( 1 );
// Sample Data
dt = New Table( "Example",
Add Rows( 40 ),
New Column( "Group 1",
Character( 7 ),
"Nominal",
Set Values(
{"A", "A", "A", "A", "A", "B", "B", "B", "B", "B", "Control", "Control", "Control",
"Control", "Control", "Placebo", "Placebo", "Placebo", "Placebo", "Placebo", "", "",
"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", ""}
)
),
New Column( "BP 8M",
Numeric,
"Continuous",
Format( "Fixed Dec", 4, 0 ),
Set Values(
[182.595915155309, 172.512940709438, 180.774421425438, 180.620679187184,
184.202187190097, 171.439595422176, 174.589230394192, 179.109260746268,
177.787439187438, 180.687489407623, 181.804016028632, 178.085353285743,
186.313144806757, 175.347853139956, 181.103289178403, 181.288352739913,
178.777832744608, 176.763152449944, 175.768608854708, 184.167672392284,
173.550216520736, 180.718560564297, 188.500473854652, 176.718084823659,
180.174755903154, 181.462075626649, 180.330100756984, 172.886222586229,
192.050244302843, 187.037431530346, 185.501158177984, 183.877324525276,
179.931613365546, 180.493132509235, 174.944992509985, 177.663853371957,
174.717037207769, 186.677919707096, 178.12326354079, 171.230704316198]
)
),
New Column( "Group 2",
Character,
"Nominal",
Set Values(
{"", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "", "A",
"A", "A", "A", "A", "A", "A", "A", "A", "A", "Control", "Control", "Control",
"Control", "Control", "Placebo", "Placebo", "Placebo", "Placebo", "Placebo"}
)
)
);
// Graph Script
Graph Builder(
Variables( X( :Group 1 ), X( :Group 2 ), Y( :BP 8M ) ),
Elements( Position( 1, 1 ), Points( X, Y, Legend( 4 ) ) ),
Elements( Position( 2, 1 ), Points( X, Y, Legend( 5 ) ) )
);