Blog Post 25

system.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <tab id="magevision" translate="label" sortOrder="1000">
            <label>MageVision Blog Posts</label>
        </tab>
        <section id="blog25" translate="label" type="text" sortOrder="1012" showInDefault="1" showInWebsite="1" showInStore="1">
            <label>Blog Post 25</label>
            <tab>magevision</tab>
            <resource>MageVision_Blog25::blog25_configuration</resource>
            <group id="post25" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>General</label>
                <field id="active" translate="label" type="select" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                    <label>Enabled</label>
                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                </field>
                <field id="custom_field" translate="label" type="select" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
                    <label>Custom Field</label>
                    <depends>
                        <field id="active">1</field>
                    </depends>
                </field>
            </group>
        </section>
    </system>
</config>

system2.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <tab id="magevision" translate="label" sortOrder="1000">
            <label>MageVision Blog Posts</label>
        </tab>
        <section id="blog25" translate="label" type="text" sortOrder="1012" showInDefault="1" showInWebsite="1" showInStore="1">
            <label>Blog Post 25</label>
            <tab>magevision</tab>
            <resource>MageVision_Blog25::blog25_configuration</resource>
            <group id="post25" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>General</label>
                <field id="active" translate="label" type="select" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                    <label>Enabled</label>
                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                </field>
                <field id="custom_field" translate="label" type="select" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
                    <label>Custom Field</label>
                    <depends>
                        <field id="active" separator=",">0,1</field>
                    </depends>
                </field>
            </group>
        </section>
    </system>
</config>

system3.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <tab id="magevision" translate="label" sortOrder="1000">
            <label>MageVision Blog Posts</label>
        </tab>
        <section id="blog25" translate="label" type="text" sortOrder="1012" showInDefault="1" showInWebsite="1" showInStore="1">
            <label>Blog Post 25</label>
            <tab>magevision</tab>
            <resource>MageVision_Blog25::blog25_configuration</resource>
            <group id="post25" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>General</label>
                <field id="active" translate="label" type="select" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                    <label>Enabled</label>
                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                </field>
                <field id="custom_field" translate="label" type="select" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
                    <label>Custom Field</label>
                    <depends>
                        <field id="active">1</field>
                    </depends>
                </field>
            </group>
            <group id="post25b" translate="label" type="text" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>Settings</label>
                <field id="custom_field2" translate="label" type="select" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                    <label>Custom Field 2</label>
                    <depends>
                        <field id="blog25/post25/active">1</field>
                    </depends>
                </field>
            </group>
        </section>
    </system>
</config>