Bits for plunge cutting usually have an extra cutter on the end for "drilling" down into the workpiece as you plunge. These bits include straight bits, plunge round-over bits, etc. The extra cutter is needed so that the bit can remove the material beneath it as it enters the wood.
If you want to put a detail in the middle of a board, you can use a plunge straight cutter first to make a clearance cut, then use a regular bearing profile bit with the bearing removed.
It is possible to rout in the plunge mode with the standard straight cutter as long as you do not intend plunging all the way through to insert dowels etc. once the cutter is on the move it wil certainly go down to the depth you require. Centainly end cutting bits (plunge) are better of course. I would not suggest taking the bearing off a beading bit then using it to proceed to the next step. Purchase template guides and use cutters without bearings to complete the process in one easy step. Find material on the use of the template guides before you proceed to use them as I gather from your posting that you may not have used the guides before
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