"Despite these challenges customer feedback remained strong and was reflected in increased units sold during the half," Scott said.
Wesfarmers said Kmart experienced strong double-digit growth in online sales, supported by the extension of its click & collect service and the introduction of its buy now pay later offering in Australian stores.
During that time it opened three new stores and refurbished 20 others.
Wesfarmers operates 531 Kmart stores across New Zealand and Australia.
Kmart is set to open a string of stores throughout New Zealand this year, including in Rotorua, Invercargill and Auckland's Sylvia Park. Last year, it opened new stores in Queenstown and Lower Hutt.
The company said the retailer would continue to focus on "relentlessly pursuing lowest cost" and improving the quality of products it offers in second half of the year.
It is also focused on growing the online arm of its business.
Wesfarmers, which also operates Officeworks and the Bunnings network in New Zealand and Australia, posted an overall AU$4.53m net profit after tax.
The profit included an AU$3m gain from discontinued operations, the Coles demerger and the canning of Bengalla and Kmart Tyre and Auto Service. Its net profit from continuing operations increased to AU$1,080m, up 10.4 per cent in the first six months of the year.
The past six months had a been a period of significant change for Wesfarmers, Scott said, adding he was pleased by progress the company had made.
Revenue for Bunnings Australia and New Zealand stores increased 5.2 per cent to AU$6.9m for the half-year. Earnings before tax increased by 7.9 per cent to AU$932m.