PDF form: Pass/print value to different text boxes based on users selection (mouseclick)

For multiple check boxes in a popup window you would have to use a popup dialog.  It's complicated.  Research the app method execDialog().

Enter the following script as a document level script:

function fillField()
{
var cb1="The text for check box 1";
var cb2="The text for check box 2";
var cb3="The text for check box 3";
var oDoc=this;
var fld=event.target;

var Dlg =
{
"Chk3": function(dialog)
{
var rslt=dialog.store();
if(rslt["Chk3"])
{dialog.end(fld.value=cb3);}
},
"Chk2": function(dialog)
{
var rslt=dialog.store();
if(rslt["Chk2"])
{dialog.end(fld.value=cb2);}
},
"Chk1": function(dialog)
{
var rslt=dialog.store();
if(rslt["Chk1"])
{dialog.end(fld.value=cb1);}

},
description:
{
name: "Dialog",
elements:
[
{
type: "view",
elements:
[
{
type: "check_box",
item_id: "Chk1",
name: cb1,
font: "dialog",
bold: true,
},
{
type: "check_box",
item_id: "Chk2",
name: cb2,
font: "dialog",
bold: true,
},
{
type: "check_box",
item_id: "Chk3",
name: cb3,
font: "dialog",
bold: true,
},
]
},
]
}
};
app.execDialog(Dlg)
}

This dialog has 3 check boxes.  You will need to modify the text in the quotes for cb1, cb2, and cb3 at the beginning of the script.  If you need more check boxes you can follow the pattern and add more.  Then, enter the following On Focus action script in any text field where you want this to populate:

fillField();

It's probably better to have a button to activate the dialog instead of an On Focus action.