Template Items- Default row Import scenario execution

Hi Everyone!

@KarthikGajendran May be you can help here.

We have 1000+ Items which contains only one variant. 

For an example

CURTIS is my Inventory and below are child items

Color is my variant.

Now I want to create a Template Item and assign Template ID to child items

When I am creating a template ID, We need to assign a default row and column in the configuration.

But I want to update all 1000 + Items only either as default row and column, but system shows two are mandatory,

Manually I am marking all other variants marked as not required which allows one default row/coumn as a mandatory and saving the record but I want to implement same steps in the import scenario for 1000+ Items

Please assist me how to execute above scenairo in imports

How we are handling Import if we have only one variant?