<!-- Define the common element in a separate XML file -->
<record id="common_element" model="ir.ui.view">
    <field name="name">common.element</field>
    <field name="model">your.model</field>
    <field name="arch" type="xml">
        <form>
            <!-- Your common element goes here -->
            <field name="your_field"/>
        </form>
    </field>
</record>

<!-- In another XML file, use XPATH to reference the common element -->
<record id="view1" model="ir.ui.view">
    <field name="name">view1</field>
    <field name="model">your.model</field>
    <field name="inherit_id" ref="module_name.common_element"/>
    <field name="arch" type="xml">
        <xpath expr="//field[@name='your_field']" position="after">
            <!-- Your additional elements for this view go here -->
        </xpath>
    </field>
</record>