Customer info (partner) in header | odoo 12 - postgresql

Question

I want to optimize the space and be a little more tidy.
For this I wanted to put in the header the info of the company and that of the client.
being the following provision:
LOGO | my company | partner
The part of the logo I have been able to dimension and that of my company it is easy because it will never change, I can write it by hand and it is always repeated, but the client part, I do not know how to complete it with "t-fields"
Anyone know a manual or give me a hand to know the fields I need.
thank you!

Answer 1

As I can see you need header in three part so use given template.
<template id="custom_layout_header" inherit_id="report.external_layout_header">
<div class="header" position="replace">
<div class="header">
<style>
.bottom-bt{border-bottom: 1px solid black;}
</style>
<div class="row">
<div class="col-xs-3" style="margin-top:25px;">
<img t-if="company.logo" t-att-src="'data:image/png;base64,%s' % company.logo" style="max-height: 45px;"/>
<br/>
</div>
<div class="col-xs-6">
<center><b>
<h3><span t-esc="company.name"/></h3>
</b>
<p>
<span t-esc="company.street"/><span t-esc="company.street2"/>
<br/><span t-esc="company.city"/>,<span t-esc="company.zip"/>,<span t-esc="company.state_id.name"/>,<span t-esc="company.country_id.name"/>
</p></center>
</div>
<div class="col-xs-2">
<span t-field="company.rml_header1"/>
</div>
</div>
<div class="row">
<div class="col-xs-6">
<p class="text-left">your partnerfields<span t-esc="yourpartnerfield"/></p>
</div>
</div>
<div class="row zero_min_height">
<div class="col-xs-12">
<div class="bottom-bt"></div>
</div>
</div>
</div>
</div>
</template>