Help coding for 10 different X Axis

I have a table, “control 1,” for the manual input of mid asset prices for the x axis, eg 12600 for the £/$. 

In another table called "Legs 1-10 P/L,” I have 10 columns of x axis data (10 columns with 100 rows above and 100 below the mid price in increments of +/-25), located in columns L2 to U2, that is sourced from the real data in columns A to J).

The offset code for the first Leg in Col L is:

IFERROR(OFFSET($A$2, ROW(cell)− ROW($L$2), MATCH('Control 2 - Individual / Strategies'::$B$2, $A$1:$K$1,0) − 1), "")

I want to be able to manually enter the mid asset prices in B2, C2, D2 etc to K2 in “Control 1” and have the choice of which x axis data to display for the charts x axis (vertical right display) from "Legs 1-10 P/L.”

Eg Legs 1, 2 and 3 are £/$ trades and the mid asset price value at the time of trade = 12600 (ranging from 10100 to 15100). I would like to be able to use the offset formulas (as I have for plotting other x and y axis data), so that the chart will show the asset prices from 10100 to 15100 below the x axis. 

How can I achieve this?

Cheers!