Code 1:

<report
id="my_custom_report"
model="project.project"
string="My Custom PDF"
report_type="qweb-pdf"
name="custom_module.my_report"
file="custom_module.my_report"
print_report_name="(object.name or 'report_name') + '_Report'"
/>

Code 2 :

class MyCustomWizard(models. TransientModel):
_name = 'custom_module.my_custom_wizard'
_description = 'Custom Wizard for PDF Report'

def action_generate_report(self):
return self.env.ref('custom_module.my_custom_report').report_action(self)

Code 3:

<record id="view_project_form" model="ir.ui.view">
<field name="name">project.form</field>
<field name="model">project.project</field>
<field name="arch" type="xml">
<form string="Project">
<!-- Your existing form view structure -->
<button name="action_generate_report" type="object" string="Generate PDF" class="btn-primary"/>
<!-- Your existing form view structure -->
</form>
</field>
</record>

Code 4:

<record id="action_my_custom_wizard" model="ir.actions.act_window">
<field name="name">My Custom Wizard</field>
<field name="res_model">custom_module.my_custom_wizard</field>
<field name="view_mode">form</field>
<field name="target">new</field>
</record>