Cut/paste with from one workbook to another - excel

Question

I have a workbook called "Data" with raw data on the "Unprocessed" sheet.
I am trying to create a sheet for every agent, called "agent" (this will be changed for every agent but for ease we will call it this for now) that pulls raw data, one row at a time, into their work area from the data workbook.
I need cells A2:M2 cut from the "Unprocessed" sheet and pasted into A4:M4 of the "agent" sheet.
I get "out of range" error. I tie this sub to a button the agents hit to bring up a new row of data.
Sub newcancel_click()
If Range("M4").Value = "EN" Then
MsgBox "You must Complete Previous cancellation.", vbCritical, "Error"
Else
Sheets("Uncompleted").Select
Range("A1:L1").Select
Application.CutCopyMode = False
Selection.Copy
Sheets("Jeremy").Select
Range("B4").Select
ActiveSheet.Paste
Sheets("Uncompleted").Select
Rows("1:1").Select
Application.CutCopyMode = False
Selection.Delete
Shift:=xlUp
Sheets("Jeremy").Select
End If
End Sub
After this, I will need to create a sub to move the data from the work area to a "Processed" sheet on the "Data" book. I am comfortable that I will be able to write this sub once I get the first one working.

Answer 1

As for your current code, the following should work better.
Sub Newcancel_click2()
If ThisWorkbook.Sheets(1).Range("M4").Value = "EN" Then
MsgBox "You must Complete Previous cancellation.", vbCritical, "Error"
Else
Sheets("Jeremy").Range("B4:M4").Value = Sheets("Uncompleted").Range("A1:L1").Value
Sheets("Uncompleted").Rows(1).EntireRow.Delete shift:=xlUp
End If
End Sub
An interesting read for you: How to avoid using select in VBA
As for your issue, "Subscript out of range" might mean some of your ranges aren't defined properly. Your selection might not match the copy destination, or (most likely) the sheet you're referring to doesn't exist (either a typo or you've not created it yet).
To refer to another workbook you can use Workbooks("Workbook name").Sheets("Sheet name").Range etc. You can use activeworkbook to refer to the currently active workbook (not recommended as per above link to avoid using select) and you can refer to the workbook your VBA code is in with Thisworkbook, this is easier than using two statements: Workbook("Name for this one") and Workbook("Name for the other one")
In your case this would look something like:
Sub Newcancel_click2()
If ThisWorkbook.Sheets(1).Range("M4").Value = "EN" Then
MsgBox "You must Complete Previous cancellation.", vbCritical, "Error"
Else
Workbook("Agent").Sheets("Jeremy").Range("B4:M4").Value = Thisworkbook.Sheets("Uncompleted").Range("A1:L1").Value
Thisworkbook.Sheets("Uncompleted").Rows(1).EntireRow.Delete shift:=xlUp
End If
End Sub
(please note I made an approximation to most of your workbook and sheet names, please check and replace with your actual names)