Hallelujah! Thankyou. Entering only the section that needs updating does seem to work. This is my code:
{
"fields" : [
{
"name" : "bandLT",
"type" : "esriFieldTypeString",
"alias" : "Band colour - LEFT TOP",
"sqlType" : "sqlTypeOther",
"length" : 4,
"nullable" : true,
"editable" : true,
"visible" : true,
"domain" :
{
"type" : "codedValue",
"name" : "cvd_bandLT",
"codedValues" : [
{
"name" : "Make Selection",
"code" : "ms"
},
{
"name" : "Unsure",
"code" : "Un"
},
{
"name" : "Black N",
"code" : "N"
},
{
"name" : "Orange O",
"code" : "O"
},
{
"name" : "Green P",
"code" : "P"
},
{
"name" : "Mauve U",
"code" : "U"
},
{
"name" : "Mauve U",
"code" : "U"
},
{
"name" : "Yellow Y",
"code" : "Y"
},
{
"name" : "White W",
"code" : "W"
},
{
"name" : "Blue B",
"code" : "B"
},
{
"name" : "Red R",
"code" : "R"
},
{
"name" : "Pink K",
"code" : "K"
},
{
"name" : "Metal M",
"code" : "M"
},
{
"name" : "Wild (unbanded)",
"code" : "Wild"
}
]
},
"defaultValue" : null
}
]
}