Onchange the values of next page fields

Question

I have created new page named 'service' in account move line and added some fields in to it.Now i want to auto fill the next page('invoice lines')fields when changing corresponding fields in the 'service' page. anyone could you please help me

here is my .py code

from odoo import models, fields, api, _


class XnProjectService(models.Model):
    _inherit = 'account.move'

    nx_service_line_ids = fields.One2many('nx_service_line', 'nx_account_move_id',
                                          string="service Lines",
                                          readonly=True,
                                          states={'draft': [('readonly', False)]}, copy=True)


class NxProjectServiceLine(models.Model):
    _name = 'nx_service_line'
    _description = "Nx Service Line"

    nx_account_move_id = fields.Many2one('account.move', string="Account ID")

    nx_product = fields.Many2one('product.product', string='Product', required='1')
    nx_commission = fields.Float(string="Commission")
    nx_label = fields.Char(string='Label')
    nx_quantity = fields.Float(string="Quantity", default='1.0')
    nx_gvnmt_fee = fields.Float(string="Government Fee")
    nx_rate = fields.Float(string="Rate")
    nx_amount = fields.Float(string="Amount")
    nx_3rd_party_amount = fields.Float(string="Third Party Amount")
    xn_tax_id = fields.Many2one('account.tax', string="Vat")

    @api.depends('nx_quantity', 'nx_rate')
    def nx_compute_amount(self):
        for record in self:
            record.nx_amount = record.nx_quantity * record.nx_rate
            record.nx_gvnmt_fee = record.nx_quantity * record.nx_product.nx_government_fee_amount
            record.nx_3rd_party_amount = record.nx_quantity * record.nx_product.nx_third_party_amount
            record.nx_commission = record.nx_quantity * record.nx_product.nx_commission_amount

    @api.onchange('nx_product')
    def _get_label(self):
        self.nx_label = self.nx_product.name
        self.nx_rate = self.nx_product.list_price
        self.nx_gvnmt_fee = self.nx_product.nx_government_fee_amount
        self.nx_3rd_party_amount = self.nx_product.nx_third_party_amount
        self.nx_commission = self.nx_product.nx_commission_amount

`