Change the start and end of the selection. Adding extra line breaks might also be a good idea. You should also use MailItem.GetInspector instead of Application.ActiveInspector as the message is not yet displayed.
Set OutApp = CreateObject("Outlook.Application")
Set OutMail = OutApp.CreateItem(0)
With OutMail
.CC = "xyz@anc.com"
.BCC = "abc@xyz.com"
.Subject = "Test"
.Body = "Dear" & "Macro " & vbCrLf
ActiveSheet.Range("P36:X46").Copy
set vInspector = OutMail.GetInspector
Set wEditor = vInspector.WordEditor
wEditor.Application.Selection.Start = Len(.Body)
wEditor.Application.Selection.End = wEditor.Application.Selection.Start
wEditor.Application.Selection.Paste
.display
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