How to make one field Dependent on other field's value in meteor autoform?

i'm new to meteor and i want to create a form in which the value of one field decides the value of another field in the autoform. Let us take setup types as "A","B",and "C", so when I select "A" a autoform will be loaded. I have made this form as generic i.e it will be displayed for all A,B,and C.

{{#each users}}
        {{> afQuickField name='userEmail' value=userEmail readOnly=true }}
        {{> afQuickField name='Setup' value=type readOnly=true}}  
        {{> afQuickField name='Profile' options='allowed' }}
        {{> afQuickField name='Purpose' }}
        {{> afQuickField name='count' options='allowed' }}
        {{> afQuickField name='PackageDirectory' options='allowed'  }}
        {{> afQuickField name="logName" options=LogName }}
 {{/each}}

The count options should be:
1. For "A" count options should be 9,11,12.
2. For "B" it's 1.
3. For "C" it's 5.
In schema I have written code like this

Setup:{
        type: String,
        label:"Setup",
        optional:false,
       defaultValue:type
      },
 count:{
        type: String,
        label:"No. Of count",
         optional: true,
        allowedValues:["9","11","12"],
        autoform:{
          afFieldInput:{
            firstOption:"(Select the count)"
          }
        }
  }

So when i select setup "A" i should get the three dropdown options and when i click "B" and "C" i should get the default value as 1 and 5 respectively. Can anyone give solution to my problem?

You can use getFieldValue to get a particular field's value, and based on it return a set of option or defaultValue from the template helper. Documentation is found here

So in accordance with your code:

form.html:

    ...
{{#autoForm id="sampleFormID" ... ... }}
    {{> afQuickField name='Setup' value=type readOnly=true}}  
     {{> afQuickField name='count' options=allowedOptionHelper defaultValue=defaultValueHelper }}
    ...

{{/autoForm}}

form.js

Template.templateName.helpers({

    allowedOptionsHelper: function() {
        if (AutoForm.getFieldValue('Setup', 'sampleFormID') === 'A') {
            return [{label:"9", value:"9"},{label:"11",value:"11"},{label:"12", value:"12"}];
            else
            if (AutoForm.getFieldValue('Setup', 'sampleFormID') === 'B') {
                // return the options for B
            } else if (AutoForm.getFieldValue('Setup', 'sampleFormID') === 'C')) {
            // return the options for C
        }
    },

    defaultValueHelper: function() {
        if (AutoForm.getFieldValue('Setup', 'sampleFormID') === 'A') {
            return 11 //or whatever the defaultValue is;
        }
        //likewise for options B and C
    }

});

schema.js

...
...
 count:{
        type: String,
        label:"No. Of count",
         optional: true,
        autoform:{
          afFieldInput:{
            firstOption:"(Select the count)"
          }
        }
  }
...
...