Hello all, I've created a custom field in commerce category. But I'm unable to get into website. How to get a custom field in commerce category in to website? Thanks in advance.

By default custom fields on your commerce categories may not be included in the call to fetch them. You will need create a SuiteScript file and do something like this:

Application.on('after:Category.get', function (CategoryModel, category) {
    var lookupResults = nlapiLookupField('commercecategory', category.internalid, [
        'yourcustomfield'
    ]);
    category.customfield = lookupResults.yourcustomfield
});