In the answer above this response and below, everyone has contributed with valid ideas.
While Shashikant has started very well, he seems to have meandered a bit. Ajay Sharma has provided a broader outlook of Business Excellence models and has referred more to sales and a bit less to marketing. Kiran Shinde has been to the point and has talked about various example projects in Sales as well as marketing. Lurthu has provided relevant points some of which are approaches and some are examples.
Kiran Shinde is the winner for this question as he has been to the point and has covered a variety of applications.
If we refer to the 4 P's of marketing, they are Product, Place, Price, Promotion. With advent of automation in each of these domains, the opportunities for data driven decision making have multiplied in recent times.
Product -
Product Management includes new product development which is largely driven by marketing. The entire field of DFSS is suitable for new product development. The scope of APQP (Advance Product Quality Planning) includes all stages of a product life cycle.
New product decisions - Which products to launch and promote in specific geographies makes use of Analytics and Researches of various kinds.
Product mix decisions - Many companies struggle with product mix decisions and modelling methods help in this area.
Price
Pricing and changes in pricing driven by hypothesis tests. Profitability analytics have a huge scope to bring improved business results.
Promotions
Advertising - More than other domains, the field of digital marketing is a huge potential area for analysis and decision making with Lean Six Sigma methods as well as analytic based approaches. This includes areas like Google Ads, and Social media ads among others.
Personal Selling assisted by chats and chatbots is another booming area for LSS professionals.
Social Media Engagement - Sometines engagement works better than direct selling and this is being heavy utilized in social media which uses analytics to a large extent.
Public Relations - Decisions on use of celebrities, media posts and PR methods is driven by results that they derive.
Place
Regions to serve and areas to be present. This is a strategic decision area which is supported by data analytics.
Efficiency of intermediaries in marketing sales channels is being analyzed. Wholesalers, retailers, commission agents etc both in brick and mortar world and in digital world increase reach and have huge areas of application.
In the field of Sales Management, the entire sales funnel and sales pipelines are suitable for LSS applications. This includes the sequences and conversions in Suspects - Prospects - Leads - Proposals -leading to Business Accounts.