Hi,

Using context you can achieve it.

See the sample code,

<field name="timesheet_ids" context="{'default_project_id': project_id}">
    <tree editable="bottom" string="Timesheet Activities" default_order="date">
        <field name="date"/>
        <field name="user_id" invisible="1"/>
        <field name="employee_id" required="1"/>
        <field name="name"/>
        <field name="unit_amount" string="Duration" widget="float_time"/>
        <field name="project_id" invisible="1"/>
    </tree>
</field>

Here,

context="{'default_field_in_one2many': field_in_parent}"

Thanks