Library Journal's "Collection Development: Part-Time Businesses, March 1, 2011" discusses works helpful for people who want to start or run a part-time business. Some of those works that emphasize management are mentioned here.
Few works are actually limited in scope to part-time businesses. Most of the works in the Library Journal article focus on the kind of businesses that can be part-time or full-time—perhaps beginning part-time. Nevertheless, browsing the Relative Index for "part-time" yields useful results:
Part-time enterprises—management 658.041
Part-time enterprises—management—initiation 658.1141
The entry for 658.041 Individual proprietorships has the notes:
Including part-time enterprises
Class here one-person enterprises, self-employment enterprises
Class executive management by entrepreneurs in 658.421
For one-person corporations, see 658.045
In the upward hierarchy for 658.041 is 658.04 Management of enterprises of specific forms, which has the see reference: "For initiation of specific forms of ownership organization, management of new enterprises of specific forms, see 658.114." See references have hierarchical force. The Mocha Manual to Turning Your Passion into Profit: How to Find and Grow Your Side Hustle in Any Economy is classed in 658.1141 Initiation of individual proprietorships (built with 658.114 Initiation of business enterprises by form of ownership organization plus 1 from 658.041 Individual proprietorships, following instruction at 658.114).
Many of the works in the Library Journal article emphasize home-based businesses. Browsing the Relative Index for "home-based" yields:
Home-based enterprises—management 658.0412
Home-based enterprises—management—initiation 658.11412
Works that focus on managing—or starting up and then managing—home-based businesses are classed in 658.0412 Home-based businesses, e.g., Ultimate Homebased Business Handbook: How to Start, Run and Grow Your Own Profitable Business and Start & Run a Real Home-Based Business.
Works on starting up and then managing a specific form of business enterprise are classed with managing in 658.04+ rather than with starting up in 658.114+ because the comprehensive number is 658.04+. How does one know that? The see reference quoted above leads from 658.04 Management of enterprises of specific forms to 658.114 Initiation of business enterprises by form of ownership organization. By definition, a see reference "leads from the stated or implied comprehensive or interdisciplinary number for a subject to component parts of the subject in numbers other than direct subdivisions of the original number or span."
The Manual note 658.04 vs. 658.114, 658.402 Management of enterprises of specific forms vs. Initiation of business enterprises by form of ownership organization vs. Internal organization can help in deciding between 658.04+ and 658.114+:
Use 658.04 for comprehensive works on management of enterprises of specific legal or ownership forms (e.g., corporations, partnerships). Use 658.114 for works that focus on initiating enterprises of specific legal or ownership forms—either starting a new business or converting an existing business to a new form, e.g., starting up a new individual proprietorship 658.1141, converting an individual proprietorship to a corporation 658.1145.
. . . . .
If in doubt, prefer in the following order: 658.04, 658.114, 658.402.
Some of the works in the Library Journal article focus on businesses in specific fields. In the upward hierarchy for all the numbers mentioned thus far, at 658 General management, is the scatter see reference: "For management of enterprises engaged in a specific field of activity, see the field, plus notation T1—068 from Table 1, e.g., management of commercial banks 332.12068, management of automobile manufacturing 629.222068." The Handmade Marketplace, for example, is classed in 745.50688 Marketing management of handicrafts, built with 745.5 Handicrafts plus T1—0688 Management of distribution (Marketing). Browsing the Relative Index for "marketing management" yields:
Marketing management 658.8
Marketing management T1—0688