How to make sidebar and filter in Product-Category Page?
<p>I am newbie in woocommerce.</p>

<p>Currently, I am using the GreatStore theme in Wordpress.
And I am trying to make filter by size of the tablet on the top and make sidebar. 
But I do not know how to do that and the theme seems no offer for that. (No sidebar widget in product-category page)
Can anyone tell me how can I make those in Product-category page?</p>

<p>This is the page: <a href="http://dev.myhexa.com/product-category/Windows/" rel="nofollow">http://dev.myhexa.com/product-category/Windows/</a></p>

<p>Thanks,</p>