| Subject | English | Bulgarian |
| comp., MS | add-on device | разширително устройство (A device that is traditionally added to the base computer system to increase functionality, such as audio, networking, graphics, or SCSI controller) |
| fin. | add-on interest | добавен процент |
| fin., insur. | capital add-on | допълнително набиране на собствени средства |
| fin., insur. | capital add-on | добавен капитал |
| comp., MS | Mail Migration add-on | Добавка Mail Migration (A tool that allows users to upload email messages, email folders, and contacts from an email account on their PC to the cloud to facilitate access from multiple devices) |
| comp., MS | Microsoft Online Services Sign-In Add-On | добавка за влизане на Microsoft Online Services (A required update for Microsoft Online Services that updates the Microsoft Online Services ID Sign-In Assistant to work with other Office programs) |