[Dxbase] Chane YT6 to 4O in pre-map-alias

[allan1 at dejazzd.com]

I have entered 4O, Montenegro and all the pertinent info on a new line in the prefix page and it is saved since I saw it in the logical progression of prefixes.  Now how do I delete the YT6 Montenegro which already exists there?  I tried to enter in alias the 4O0-4O9 on 10 lines, but it wouldn't accept it.  I also have to remove all the prefixes associated with YT6-could use help there as well

Do I also have to make changes in mapping?  I tried to enter there as well and it wouldn't let me
I got the first part right , (prefix) but after that, mapping and alias were nada.  Could someone please take me through it step by step, because even though I have had DXB 2006 for less than a year? I am still getting used to it
Thanks
Allan W2TN