Hey guys, I need a little assistance,

I need to set up a macro that would erase first X letters of Y column and it should start doing it from Z row.

the X is defined in L2 ( number 7 for example)
the Y is defined in J2 ( B for example)
the Z is defined in K2 ( number 2)

I seem to be lost.

Any help will be apreciated.
Thank you.

P.S.: I've included the file here: https://www.sendspace.com/file/i9x7bs