As Uday said to create templates you need to install VCenter. ESXI itself just support base features. ESXI6.7 create virtual machine dialog box is as follow :
ESXI 6.7 create machime dialogbox
As you can see there is no template feature here.but when you install VCenter you can use more advanced feature like Template,DRS,HA,FT and so on .This is VCenter create machine dialog :
VCenter 6.7 create nachine dialogbox
But if you can not afforad a VCenter or you don't like to use it because of administration reason, maybe create a OVF from your machine and import it every time you need is a solution. Remember that with template you can create template policies that help you customize templates every time you deploy it.Even sysprep windows machine or change the machine name and ... . i hope this help you.