Hi,

One option is to create a One2many compute field on res.partner model and call that on a tab in customer form view. So when you open the customer form, under a "Products" tab, you may see the existing products of the customer. You may check the tutorial on how to create a One2many compute or functional field. Or else you may contact me on akhilpsivan01@gmail.com for further help.

For example, you may try by adding the following code:

in your .py file:

class project_task(models.Model):
    _inherit = "project.task"
    customer = fields.Many2one('res.partner', string="Search Customer Name")
    products = fields.One2many('product.template', compute='_get_products', string="Products")
    
    @api.one
    @api.depends('customer')
    def _get_products(self):
        if self.customer:
            product_list = self.env['product.supplierinfo'].search([('name.id','=',self.customer.id)])
            if product_list:
                p_list = []
                for supp in product_list:
                    p_list.append(supp.product_tmpl_id.id)
                prod = self.env['product.template'].browse(p_list)
                self.products = prod

in your xml file:

<record id="view_task_form2_inherited" model="ir.ui.view">
            <field name="name">project.task.form.inherited</field>
            <field name="model">project.task</field>
            <field name="inherit_id" ref="project.view_task_form2"/>
            <field name="arch" type="xml">
            	
            	<field name="reviewer_id" position="after">
                	<field name="customer" />
                </field>
                <notebook position="inside">
                	<page string="Products">
                           <field name="products" /> 
                        </page>
                </notebook>
            </field>
       </record>