You have to make "woocommerce" folder and other folder in child theme.
Copy
themes/ireca/woocommerce/
to
themes/ireca-child/woocommerce
1: Customize Archive/Category template
to know layout of category.
Copy file:
themes/ireca/woocommerce/rental/archive-product.php
to
themes/ireca-child/woocommerce/rental/archive-product.php
a) If layout of category is "2 columns with Sidebar"
Copy file:
themes/ireca/woocommerce/rental/content-product_2columns.php
to
themes/ireca-child/woocommerce/rental/content-product_2columns.php
b) If layout of category is "3 columns no Sidebar"
Copy file:
themes/ireca/woocommerce/rental/content-product_3columns.php
to
themes/ireca-child/woocommerce/rental/content-product_3columns.php
c) If layout of category is "Style 1 with Sidebar"
Copy file:
themes/ireca/woocommerce/rental/content-product_style1.php
to
themes/ireca-child/woocommerce/rental/content-product_style1.php
d) If layout of category is "Style 2 with Sidebar"
Copy file:
themes/ireca/woocommerce/rental/content-product_style2.php
to
themes/ireca-child/woocommerce/rental/content-product_style2.php
e) If layout of category is "Style 3 with Sidebar"
Copy file:
themes/ireca/woocommerce/rental/content-product_style3.php
to
themes/ireca-child/woocommerce/rental/content-product_style3.php
2: Customize Product Detail Template
Copy file:
themes/ireca/woocommerce/rental/content-single-product.php
themes/ireca/woocommerce/rental/content-single-product2.php
to
themes/ireca-child/woocommerce/rental/content-single-product.php
themes/ireca-child/woocommerce/rental/content-single-product2.php
3) Customize Shop template
Copy file:
themes/ireca/woocommerce/archive-product.php
to
themes/ireca-child/woocommerce/archive-product.php