You are already using some computer programs for your work in the company for general, managerial and administrative point of view and now you have intentions to move to more towards management of computer applications and softwares in the company. If I get you correctly then you can keep continuing your good work there and simultaneously go for some computer course which gives you knowledge about the various applications which can be used in our company for enhancing the productivity.
Some of such courses which can prepare you to take up the role of a technical person than the office executive type of job are related to computer applications and their usefulness and the way they are to be inducted there.
(1) Computer Networking - This course will give you a lot of insight for how the computers are networked with each other and can be used in a shared or remote environment. What are the softwares required for doing it and other basics of networking. After doing this you will be able to suggest and advise for networking requirement of the company.
There are many certificate courses of short or medium durations available part time or online and you can choose one among that depending upon your other schedules.
(2) Computer Security and System Management - This area is very important as it teaches you the ways how to keep your system secure by using firewalls or software programs to check the entry of virus or other malicious things to your computer and it is now emerging as a good area to work. There are various certificate courses available and if you have interest in this highly technical line you can think about it.
(3) Interactive Multimedia Development - How this course will be helping you is to be seen in the light of changing your job from this company to elsewhere or preferably a new role in this company itself. This course gives skills for creative work using Dreamweaver, Photoshop, Sound Forge, Premier Pro and 2D flash / 3dx Max. If you have interest in this technical line you can consider it.
(4) Certificate course in advance Financial Accounting - If you want to retain your expertise in the area you are working then this is a good course and it encompasses Concept of Job costing, Point of sales, excise duty, payroll, manufacturing inventory, security level and auditing share accounting using Tally ERP 9. This is a short course.
I have not included the pure software courses here as that is not the interest shown in your query but if you have a interest in that area then it can also be explored by learning web designing or Java and things like that.
Knowledge is power.