Help with datestamp auto-updating

I know this has been covered extensively, but I just cannot figure this out. I have a macro to copy and insert a new line and when it is clicked all the dates update.

If someone would be kind enough to take a look at this and offer suggestions I would greatly appreciate it. This is my current macro:

Sub New_Delta()

' Go to last cell
Cells(Rows.Count, 1).End(xlUp).Offset(1, 0).Select

' Copy formula from cell above
Rows(4).Copy
Rows(Selection.Row).Insert Shift:=xlDown

End Sub

2015 R&M_v2.xlsm

Hi taylork65 and welcome to ExcelForum,

It looks like all your dates are referenced to the 'current date' and probably should be stand alone.
The following will probably do what you want:

Option Explicit

Sub New_Delta()

  Dim iRowAfterLastRowUsed As Long

  ' Go to last cell
  iRowAfterLastRowUsed = Cells(Rows.Count, 1).End(xlUp).Offset(1, 0).Row

  ' Copy formula from cell above
  Rows(4).Copy
  Rows(iRowAfterLastRowUsed).Insert Shift:=xlDown
  
  'Insert Today's date in Column 'G'
  Cells(iRowAfterLastRowUsed, "G") = Date

End Sub

Here are a couple of tips which may help you in the future:
To prevent typos from ruining days and weeks of work 'Option Explicit' is NEEDED at the top of each code module. This prevents errors caused by missspellings and FORCES every variable to be DECLARED (e.g. dim i as Integer). http://www.cpearson.com/excel/DeclaringVariables.aspx

Debugger Secrets:
a. Press 'F8' to single step (goes into subroutines and functions).
b. Press SHIFT 'F8' to single step OVER subroutines and functions.
c. Press CTRL 'F8' to stop at the line where the cursor is.
d. 'Left Click' the margin to the left of a line to set (or clear) a BREAKPOINT.
e. Press CTRL 'G' to open the IMMEDIATE WINDOW. 'debug.print' statements send their
output to the IMMEDIATE WINDOW.
f. Select View > Locals to see all variables while debugging.
g. To automatically set a BREAKPOINT at a certain location put in the line:
'Debug.Assert False'
h. To conditionally set a BREAKPOINT at a certain location put in lines similar to:
if i >= 20 and xTV20 > 99.56 then
Debug.Assert False
endif
i. A variable value will be displayed by putting the cursor over the variable name.

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Lewis