Template inheritance of the client-side in odoo 10 - odoo

Question

I want add a link for download a demo file, in the template base_import. The original template is it as show below:
<t t-name="ImportView">
<t t-set="_id" t-value="_.uniqueId('export')"/>
<form action="" method="post" enctype="multipart/form-data" class="oe_import">
<input type="hidden" name="csrf_token" t-att-value="csrf_token"/>
<input type="hidden" name="session_id"
t-att-value="widget.session.session_id"/>
<input type="hidden" name="import_id"/>
<div class="oe_import_box col-sm-9">
<div class="col-sm-12">
<p>Select a CSV or Excel file to import. Help</p>
</div>
<div class="col-sm-10">
<div class="input-group">
<input type="text" class="oe_import_file_show form-control" placeholder="No file chosen..."/>
<span class="input-group-btn">
<label class="btn btn-primary" for="my-file-selector">
<input accept=".csv, .xls, .xlsx, .ods" id-attf-id="file_#{_id}"
name="file" id="my-file-selector" class="oe_import_file" type="file" style="display:none;"/>
Load File
</label>
</span>
<span class="input-group-btn">
<button type="button" class="btn btn-default oe_import_file_reload" disabled="disabled">Reload File</button>
</span>
</div>
</div>
<!-- More code -->
</div>
</form>
</t>
The code that i write for link add is:
<t t-name="BaseImportCustom" t-extend="ImportView">
<t t-jquery="form.oe_import" t-operation="append">
<p>Download Demo</p>
</t>
</t>
but this not show the link, Somebody know because not work? or if exist another way of do this

Answer 1

First, could you double check if xml file was already declared in __manifest__.py of your new module ?
Second, You shouldn't add t-name="BaseImportCustom" in your extend view, i believe the issue comes from t-name="BaseImportCustom", you can search all xml files in Odoo with the key "t-extend" and notice that there is no case that"t-extend" exist with "t-name". I hope this is OK (not test yet)
<t t-extend="ImportView">
<t t-jquery="form.oe_import" t-operation="append">
<p>Download Demo</p>
</t>
</t>