Hi,

To block importing and creating of records, You can just give import="0" or import="false"  and create = "false" in the tree view XML code.

Example:
<tree create="false" import="false">

</tree>

Inherit tree view of the company model and add this attribute, You can use following code,

<?xml version="1.0" encoding="utf-8" ?>

<odoo>
<templates id="template">
     <record id="view_company_tree" model="ir.ui.view">
<field name="name">res.company.inherited.form.view</field>
<field name="model">res.company</field>
        <field name="inherit_id" ref="base.view_company_tree"/>
        <field name="arch" type="xml">
            <xpath expr="//tree" position="attributes">
                <attribute name="create">0</attribute>
                <attribute name="import">0</attribute>
            </xpath>
        </field>
     </record>

</odoo>

Hope it helps,