Assume that the C that Paul mentioned is Column C, here are some possibilities.
Sub transfer_1()
Dim shSource As Worksheet, shDest As Worksheet
Set shSource =Sheets("profile list")
Set shDest = Sheets("RADIANT OPTO-ELECTRONICS CORP.")
shDest.Cells(3, 11).Value = shSource.Cells(30,37).Value '<---- Values only
shSource.Cells(30,37).Copy shDest.Cells(3, 11) '<---- All
End Sub
Sub transfer_2()
Sheets("RADIANT OPTO-ELECTRONICS CORP.").Cells(3, 11).Value = Sheets("profile list").Cells(30,37).Value
End Sub
Sub transfer_3()
Sheets("profile list").Cells(30,37).Copy Sheets("RADIANT OPTO-ELECTRONICS CORP.").Cells(3, 11)
End Sub