Without changing the current open file name,
Save a copy of the file as specified in title.

The version number V should be attached to the end of the file.

If the name exists, the version number should be incremented by one.

Example:
Active workbook = C:\test\book.xls

Save copy as : C:\test\bookphrase1.xls
If C:\test\bookphrase1.xls exists, proceed to C:\test\bookphrase2.xls etc.

I am a NOVICE on vba, so please do not laugh, at least I tried:

Sub test()
Dim saf As String
Dim phr As String
Dim v As Variant
'
phr = "phrase" 'no blanks
saf = ThisWorkbook.FullName
v = 1
'
Do
If saf + phr + v = "" Then
    ActiveWorkbook.Save 'optional
    ActiveWorkbook.SaveCopyAs saf + phr + v
Else
    v = v + 1
    Exit Do
End If
Loop
End Sub