If you create a slide design (theme) and you want to save it as a template (.potx file), simply do the following:
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Open the presentation that contains the slide design (theme) that you want to save as a template.
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Select File > Save As.
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Browse to C:\Users\<your username>\Documents\Custom Office Templates.
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In the Save As dialog box, in the File name box, type a name for the template.
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In the Save as type list, select PowerPoint Template, and then click Save.
Use your new template
To make use of your template when you create a new presentation:
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Select File > New.
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Select Custom > Custom Office Templates to find your template.
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Select your template, and then click Create.
Themes vs. Templates
Themes are different than templates in PowerPoint:
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A theme is a slide design made up of cohesive colors, fonts, and effects such as shadows or reflections.
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A template includes a theme, but also contains instructions in placeholders suggesting what to insert and what types of information the user of the template might want to include.