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Whether growing indoors or out, if you "let" one plant get pollinated, you will most likely contaminate your other plants. That means that your buds will not be sensimillia, and your yield will be much less.
IF you really want to produce some seeds, and you have some pollen, or a pollen-releasing male flower, you can do it without affecting your entire crop. Just keep the pollen, or male flowers, in a plastic bag. Place that bag over one branch of a plant and secure it there. Shake it around a bit and remove from the area. This way the flowers on that one branch will be pollenated, and produce seeds, and the rest of the buds on the plant will still be seedless, if you are careful with the pollen. The seeded branch will procuce many seeds.
Just keep in mind that the seeds that you produce will be F1 hybrids, and as such, will be extremely variable in the traits exhibited.
HTH