Hi,

To add new position to a block, please open the .php file of the block and define new position using the following format:

<jdoc:include type="modules" name="<?php $this->_p('your_module_position_name') ?>" />

If you want to add multiple module positions and fix the width of the position as you mentioned in your message, you could use:

<div class="row">

	<div class="col-md-6 col-xs-12">

		<jdoc:include type="modules" name="<?php $this->_p('position-1') ?>" />

	</div>

	<div class="col-md-6 col-xs-12">

		<jdoc:include type="modules" name="<?php $this->_p('position-2') ?>" />

	</div>

</div>

In the above code, you have 2 positions: position-1 and position-2 and its width is 6 + 6 on normal layout (laptop and desktop) and full width (12 columns) in mobile. col-md is to define width in normal layout, col-sm is to define width in small layout (tablet) and col-xs is to define width in extra small layout (mobile)

To understand more about this, you should understand the bootstrap responsive grid system: http://getbootstrap.com/css/#grid

Regards.