[Koha] subfields

[anabela semedo]

Hi everyone, I'm having this problem.
in the author field I have the first and last name in different subfields and
when I use the editmarc to change it it deletes the nickname,
I just want it to look like this = 100\\$aTrevisa, Dalton not this
=100  \\$aTrevisan$bDalton


in field 260 I want to do the opposite. add the subfields to stay like this
= 260 \\$aPraia$bCape Verde Bank$c2015
but i have this=260  \\$aPraia: Banco de Cabo Verde, 2015


Can someone help me?

Ana Bela